Heat Sentence Examples

heat
  • The evening heat was stifling.

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  • The heat settled around them like a hot breath.

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  • No one had remembered to turn the heat on last night.

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  • Carmen stopped at the corner, uncomfortable with the heat of the exchange, yet unwilling to interrupt.

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  • A flood of heat washed up her throat to stain her cheeks.

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  • The thick Miami heat had never felt so good!

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  • As they watched, the figures in the dusty heat waves finally became recognizable as cavalry - even to the naked eye.

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  • The desert heat couldn't reach her private cloud.

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  • Fuming anyway, she pushed the curtains away from the balcony door and stepped into the night, winter's chill taking some of the heat out of her.

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  • Heat waves blurred the dunes around them.

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  • The heat was definitely turned up.

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  • She tasted sweet and saucy, like the woman herself, her heat, scent and silky skin filling his senses in a way that left him wanting more of her.

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  • Of course the vital heat is not to be confounded with fire; but so much for analogy.

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  • Heat and drought had continued for more than three weeks.

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  • In the heat of a battle it is easy to make a mistake.

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  • The gully shimmered in heat waves.

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  • The brilliant suns were overhead, their heat heavy in the still day.

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  • The heat at Damascus and Aleppo is great, the cooling winds being kept off by the mountains.

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  • Electricity produces heat, heat produces electricity.

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  • The riders were a blur in the heat waves, but she was sure one was Pete.

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  • She shivered at the odd connection, the heat and warmth.

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  • It is also possible to find in them many anticipations of the views of the economists of later times; but such statements were as a rule generated merely by the heat of controversy on some measure or event of practical importance, and when the controversy died down were seldom regarded or incorporated in a scientific system.

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  • The steam produced in consequence of this heat transference from the furnace gas to the water carries heat to the cylinder, where 7 to II% is transformed into mechanical energy, the remainder passing away up the chimney with the exhaust steam.

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  • Of the former, the first, published in 1896, was on the dynamics of a particle; and afterwards there followed a number of concise treatises on thermodynamics, heat, light, properties of matter and dynamics, together with an admirably lucid volume of popular lectures on Recent Advances in Physical Science.

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  • These changes are regarded as having been produced by the operation of heat, pressure and folding.

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  • Rain is brought by the west wind; the north-west wind, which blows often, moderates the heat.

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  • The heat of summer (December-March, which is the rainy season) is tempered by cool breezes; winter (MaySeptember, inclusive) is dry, cold and bracing, and frost prevails for prolonged periods.

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  • The first is carried out by saponifying the soap with acid in the heat when the fatty acids come to the surface.

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  • Let him who has work to do recollect that the object of clothing is, first, to retain the vital heat, and secondly, in this state of society, to cover nakedness, and he may judge how much of any necessary or important work may be accomplished without adding to his wardrobe.

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  • Yully met his gaze, utterly relaxed and content with his heat and power moving through her.

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  • His scent and heat, the warmth of his magic, the heady sensations of being so close to him … She concentrated on placing her feet and not on his body.

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  • Carmen lay still for a few minutes, soaking up the body heat from Alex.

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  • Gas fires, as a substitute for the open coal fire, have many points in their favour, for they are conducive to cleanliness, they need but little attention, and the heat is easily controlled.

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  • All these methods warm chiefly by means of convected heat, the amount of true radiation from the pipes being small.

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  • In electric cranes a useful method is to arrange the connexions so that the lifting motor acts as a dynamo, and, driven by the energy of the falling load, generates a current which is converted into heat by being passed through resistances.

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  • That the quantity of heat to be got rid of may become very considerable is seen when it is considered that the energy of a load of 60 tons descending through 50 ft.

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  • Over the surface of the plate and between it and the indicator there was passed, at a regularly uniform speed, in a direction perpendicular to the line of motion of the indicator, a material capable of being acted on physically by the sparks, through either their chemical action, their heat, or their perforating force.

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  • The extremes of heat and cold are very great.

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  • The arboreous forms which least require the humid and equable heat of the more truly tropical and equatorial climates, and are best able to resist the high temperatures and excessive drought of the northern Indian hot months from April to June, are certain Leguminosae, Bauhinia, Acacia, Butea and Dalbergia, Bombax, Shorea, Nauclea, Lagerstroemia, and Bignonia, a few bamboos and palms, with others which extend far beyond the tropic, and give a tropical aspect to the forest to the extreme northern border of the Indian plain.

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  • In this same region the summer heat and rain provide a thoroughly tropical climate, in which rice and other tropical cereals are freely raised, being as a rule sown early in July and reaped in September or October.

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  • Hylas, like Adonis and Hyacinthus, represents the fresh vegetation of spring, or the water of a fountain, which dries up under the heat of summer.

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  • The bark contains a large amount of a fine, highly-resinous turpentine, which collects in tumours on the trunk during the heat of summer.

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  • These he defended with great ability, but with so much heat that Erasmus joined in demanding his expulsion from the city.

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  • The evaporation from this large basin exercises a certain influence on the climate of the surrounding country, while the absorption of heat for the thawing of the ice has a notable cooling effect in early summer.

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  • But it still contains a large amount of oil, which forms animal fat and heat, and thus makes up for part of its deficiency in carbohydrates.

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  • After a short spring the heat of summer succeeds, which in its turn is followed by an autumn of six weeks' duration.

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  • Viscosity increases with density, but oils of the same density often vary greatly; the coefficient of expansion, on the other hand, varies inversely with the density, but bears no simple relation to the change of fluidity of the oil under the influence of heat, this being most marked in oils of paraffin base.

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  • It is generally understood that the products of fractional distillation, even in the laboratory, are not identical with the hydrocarbons present in the crude oil, but are in part produced by the action of heat upon them.

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  • The earliest form of testing instrument employed for this purpose was that of Giuseppe Tagliabue of New York, which consists of a glass cup placed in a copper water bath heated by a spirit lamp. The cup is filled with the oil to be tested, a thermometer placed in it and heat applied, the temperatures being noted at which, on passing a lighted splinter of wood over the surface of the oil, a flash occurs, and after further heating, the oil ignites.

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  • At Tiberias a little squadron of the brethren of the two Orders went down before Saladin's cavalry in May; at Hattin the levy masse of the kingdom, some 20,000 strong, foolishly marching over a sandy plain under the heat of a July sun, was utterly defeated; and after a fortnight's siege Jerusalem capitulated (October 2nd, 1187).

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  • In their simplest form they consist of a wire through which passes the current to be measured, some arrangement being provided for measuring the small expansion produced by the heat generated in the wire.

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  • The reason is that the heat produced in a given time in a wire is proportional to the square of the strength of the current passing through it, and hence the rate at which the heat is produced in the wire, and therefore its temperature, increases much faster than the current itself increases.

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  • When a current is passed through the wire, continuous or alternating, it creates heat, which expands the air in the bulb and forces the liquid up one side of the U-tube to a certain position in which the rate of loss of heat by the air is equal to the rate at which it is gaining heat.

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  • I knew the sky was black, because all the heat, which meant light to me, had died out of the atmosphere.

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  • I asked, pointing in the direction from which the heat came.

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  • She rose and approached, resting back on her heels in front of him, close enough for him to smell her musk and feel her heat.

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  • She started the car and blasted the heat.

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  • He remained relaxed, his large body radiating heat in the cold room.

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  • A pot-bellied stove in the middle of the main room provided the main heat in the two-bedroom room cottage.

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  • The sense of peace descended upon her again, and she relaxed against him, content to her soul to be surrounded by his scent and heat.

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  • She rolled onto her stomach away from him, blood flying with desire and heat.

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  • Watching him move made her blood heat.

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  • The soft bed was warm from her body heat, and she found herself running a hand over the downy comforter while she tried to understand the emotions within her.

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  • His comforting scent and heat filled her senses.

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  • His oak-amber scent and the heat of his skin intoxicated her, made her feel like – even if the world ended – she might not care, if she was in his arms.

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  • It is the chief health resort of the state, and its climate is one of the finest in Australia; it has a mean annual temperature of 58.6° F., and the summer heat is never excessive.

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  • The heat is moderated by the S.E.

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  • Mayer, a physician at Heilbronn, published an attempt to determine the mechanical equivalent of heat from the heat produced when air is compressed.

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  • In all cases there is a general tendency for other forms of energy to be transformed into heat on account of the friction of rough surfaces, the resistance of conductors, or similar causes, and thus to lose availability.

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  • The ore is kindled from above and the fire so regulated (by making or unmaking air-holes in the covering) that, by the heat produced References.

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  • The retorts are charged with molten sulphur from an upper reservoir, which is kept at the requisite temperature by means of the lost heat of the retort fires.

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  • With this assumption, 0.06 is the fraction of the heat energy of the coal which is utilized in the engine cylinders as mechanical work; that is to say, of the 15,000 B.Th.U.

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  • Table Xxi It is instructive to inquire into the limiting efficiency of an engine consistent with the conditions under which it is working, because in no case can the efficiency of a steam-engine exceed a certain value which depends upon the temperatures at which it receives and rejects heat.

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  • That is to say, a perfect engine working between the limits of temperature assigned would convert only 18% of the total heat supply into work.

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  • In some cases, however, they are filled with fused acetate of soda; this salt is solid when cold, but when the can containing it is heated by immersion in hot water it liquefies, and in the process absorbs heat which is given out again on the change of state back to solid.

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  • The prevalent winds, which temper the heat, are the S.E.

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  • The Chemistry of the Sun (1887) is an elaborate treatise on solar spectroscopy based on the hypothesis of elemental dissociation through the intensity of solar heat.

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  • Here he held several councils for the discussion of the affairs of the church, especially for grave questions as to the rebaptism of heretics, and the readmission into the church of the lapsi, or those who had fallen; away through fear during the heat of the persecution.

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  • In spite of the high temperatures of summer, however, the low humidity prevents the heat from being oppressive, and cases of sunstroke are unknown.

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  • As this vast mass cooled it must by the laws of heat have contracted towards the centre, and as it contracted it must, according to a law of dynamics, rotate more rapidly.

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  • The daily outpour of heat from the sun at the present time suggests a profound argument in support of the nebular theory.

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  • The amount of the sun's heat has been estimated, but we receive on the earth less than one two-thousand-millionth part of the whole radiation.

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  • Now what supplies this heat?

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  • We might at first suppose that the sun was really an intensely heated body radiating out its heat as does white-hot iron, but this explanation cannot be admitted, for there is no historical evidence that the sun is growing colder.

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  • We have not the slightest reason to think that the radiation from the sun is measurably weaker now than it was a couple of thousand years ago, yet it can be shown that, if the sun were merely radiating heat as simply a hot body, then it would cool some degrees every year, and must have cooled many thousands of degrees within the time covered by historical records.

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  • We, therefore, conclude that the sun has some other source of heat than that due simply to incandescence.

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  • It might, for example, be suggested that the heat of the sun was supplied by chemical combination analogous to combustion.

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  • We cannot, therefore, admit that the source of the heat in the sun is to be found in any chemical combination taking place in its mass.

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  • Where then can we find an adequate supply of heat?

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  • It can be shown that unless a quantity of meteors in collective mass equal to our moon were to plunge into the sun every year the supply of heat could not be sustained from this source.

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  • As the sun loses heat it contracts, and every pair of particles in the sun are nearer to each other after the contraction than they were before.

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  • The energy due to their separation is thus less in the contracted state than in the original state, and as that energy cannot be lost it must reappear in heat.

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  • The sun is thus slowly contracting; but as it contracts it gains heat by the operation of the law just referred to, and thus the further cooling and further contraction of the sun is protracted until the additional heat obtained is radiated away.

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  • In this way we can reconcile the fact that the sun is certainly losing heat with the fact that the change in temperature has not been large enough to be perceived within historic times.

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  • He wrote an admirable textbook of the Theory of Heat (1871), and a very excellent elementary treatise on Matter and Motion (1876).

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  • He treated the resultant electric force at any point as analogous to the flux of heat from sources distributed in the same manner as the supposed electric particles.

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  • It is followed by the stage of dry heat, which will be prolonged in proportion as the previous stage is curtailed.

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  • The feeling of heat is at first an internal one, but it spreads outwards to the surface and to the extremities; the skin becomes warm and red, but remains dry; the pulse becomes softer and more full, but still quick; and the throbbings occur in exposed arteries, such as the temporal.

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  • Flies seem capable of adapting themselves to extremes of cold equally as well as to those of heat, and species belonging to the order are almost invariably included in the collections brought back by members of Arctic expeditions.

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  • That vigorous chemical action is accompanied by a brisk evolution of heat is evident from such familiar examples as the combustion of fuel or the explosion of gunpowder.

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  • Hess, from his work, arrived at the converse conclusion, that when a series of bases were used to neutralize a given amount of an acid, the heat of neutralization was always the same.

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  • Andrews likewise found that when the heat evolved on.

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  • This affords an example of a principle which had been stated by Hess in a very general form under the name of the Law of Constant Heat Sums - namely, that the thermal effect of a given chemical action is the same, independently of the character and number of the stages in which it takes place.

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  • Hess now observed that in the process of mixing such neutral solutions no thermal effect was produced - that is, neutral salts in aqueous solution could apparently interchange their radicals without evolution or absorption of heat.

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  • Silbermann, whose chief theoretical achievement was the recognition that the heat of neutralization of acids and bases was additively composed of two constants, one determined by the acid and the other by the base.

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  • The existence of reactions which are reversible on slight alteration of conditions at once invalidates the principle, for if the action proceeding in one direction evolves heat, it must absorb heat when proceeding in the reverse direction.

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  • When the first system then is transformed into the second, the excess of energy which the former possesses must appear in the shape of heat, light, electrical energy, mechanical energy, &c. It is for the most part a simple matter to obtain the excess of energy entirely in the form of heat, the amount of which is easily susceptible of measurement, and thus the existence of thermochemistry as a practical science is rendered possible.

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  • The total thermal effect, too, which is associated with the transformation, must be the same, whether the transformation is conducted directly or indirectly (Hess's Law of Constant Heat Sums), since the thermal effect depends only on the intrinsic energies of the initial and final systems.

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  • For example, when metallic zinc is dissolved in dilute sulphuric acid with production of zinc sulphate (in solution) and hydrogen gas, a definite quantity of heat is produced for a given amount of zinc dissolved, provided that the excess of energy in the initial system appears entirely as heat.

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  • It is of course in such a case necessary to know the specific heat of the liquid in the calorimeter.

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  • The same type of calorimeter is used in determining the heat of solution of a solid or liquid in water.

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  • Combustion calorimeters are employed for observing the heat generated by the brisk interaction of substances, one of which at least is gaseous.

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  • If now it is required to find the heat of formation of the compound CO, which cannot be directly ascertained, we have merely to subtract the second equation from the first, each symbol representing constant intrinsic energy, and thus we obtain C+0 - 00= 26300 cal., or C+0=C0+26300 cal., that is, the heat of formation of a gramme-molecule of carbon monoxide is 26300 cal.

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  • This assumption has the great advantage, that the intrinsic energy of a compound relatively to its elements now appears as the heat of formation of the compound with its sign reversed.

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  • With knowledge then of the heats of formation of the substances involved in any chemical action, we can at once calculate the thermal effect of the action, by placing for each compound in the energy-equation its heat of formation with the sign reversed, i.e.

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  • Some of these pass into their elements with explosive violence, owing to the heat generated by their decomposition and the gaseous nature of the products.

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  • The relation between the heat of combustion of a hydrocarbon and its heat of formation may be readily seen from the following example.

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  • The above equation may consequently be written, if x is the heat of formation of methane, -x+0 = -94300-(2 X 68300) +213800 x =17000 cal.

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  • The oxygen contained in the compound was deducted, together with the equivalent amount of hydrogen, and the heat of combustion of the compound was then taken to be equal to the heats of combustion of the elements in the residue.

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  • The observed heat of combustion of sugar is, however, 1354000, so that the error of the rule is here 20 per cent.

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  • A much better approximation to the heat of combustion of such substances is obtained by deducting the oxygen together with the amount of carbon necessary to form C02, and then ascertaining the amount of heat produced by the residual carbon and hydrogen.

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  • In addition to this, the further regularity has been observed that when the powerful monobasic acids are neutralized by the powerful monacid bases, the heat of neutralization is in all cases the same.

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  • It was at one time thought that the greater the heat of neutralization of an acid with a given base, the greater was the strength of the acid.

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  • When substances readily combine with water to form hydrates, the heat of solution in water is usually positive; when, on the other hand, they do not readily form hydrates, or when they are already hydrated, the heat of solution is usually negative.

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  • The dry season lasts from October to May, the hottest months appear to be in March and April, when the heat is increased by the burning of the corn and henequen fields.

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  • These aguadQS were huge basins, paved and cemented, with underground cisterns, also lined with stone and cement, which may have been used for the protection of water against heat when the principal supply had become exhausted.

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  • The climate is generally such as to secure the population the necessaries of life without severe labour; the extremes of heat and drought are such as to render the land unsuitable for pasture, and the people everywhere subsist by cultivation of the soil or commerce, and live in settled villages or towns.

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  • The climate is very severe, with great extremes of heat and cold.

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  • The summers are hot, though short in the northern latitudes, the maximum of summer heat being comparatively little less than that observed in the tropical countries farther south.

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  • In the summer a great accumulation of solar heat takes place on the dry surface soil, from which it cannot be released upwards by evaporation, as might be the case were the soil moist or covered with vegetation, nor can it be readily conveyed away downwards as happens on the ocean.

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  • In the winter similar consequences ensue, in a negative direction, from the prolonged loss of heat by radiation in the long and clear nights - an effect which is intensified wherever the surface is covered with snow, or the air little charged with vapour.

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  • In illustration of the very slow diffusion of heat in the solid crust of the earth, and as affording a further indication of the climate of northern Asia, reference may here be made to the frozen soil of Siberia, in the vicinity of Yakutsk.

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  • The very high summer temperatures of the area north of the tropic of Cancer are sufficiently accounted for, when compared with those observed south of the tropic, by the increased length of the day in the higher latitude, which more than compensates for the loss of heat due to the smaller mid-day altitude of the sun.

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  • These tend very greatly to arrest the increase of the summer heat over the area where they prevail, and otherwise give it altogether peculiar characteristics.

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  • The great summer heat, by expanding the air upwards, disturbs the level of the planes of equal pressure, and causes an outflow of the upper strata from the heated area.

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  • This diminution of pressure, which continues as the heat increases till it reaches its maximum in July soon after the solstice, is followed by the corresponding development of the south-west monsoon; and as the barometric pressure is gradually restored, and becomes equalized within the tropics soon after the equinox in October, with the general fall of temperature north of the equator, the south-west winds fall off, and are succeeded by a north-east monsoon, which is developed during the winter months by the relatively greater atmospheric pressure which then occurs over Asia, as compared with the equatorial region.

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  • In both cases, however, the storms appear to advance towards the area of greatest heat.

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  • Such a reduction of temperature is brought about along the greater part of the coasts of India and of the BurmoSiamese peninsula by the interruption of the wind current by continuous ranges of mountains, which force the mass of air to rise over them, whereby the air being rarefied, its specific capacity for heat is increased and its temperature falls, with a corresponding condensation of the vapour originally held in suspension.

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  • The area between the southern border of Siberia and the margin of the temperate alpine zone of the Himalaya and north China, comprising what are commonly called central Asia, Turkestan, Mongolia and western Manchuria, is an almost rainless region, having winters of extreme severity and summers of intense heat.

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  • What was mistaken for it was fashioned in the heat of controversy by men whose interests were practical rather than scientific, who could not write correct English, and revealed in their reasoning the usual fallacies of the merely practical man' So the " old Political Economy " lies shattered.

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  • As early as 1804, Humboldt expressed the opinion that petroleum was produced by distillation from deep-seated strata, and Karl Reichenbach in 1834, suggested that it was derived from the action of heat on the turpentine of pine-trees, whilst Brunet, in 1838, adumbrated a similar theory of origin on the ground of certain laboratory experiments.

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  • Petroleum has very long been known as a source of light and heat, while the use of crude oil for the treatment of wounds and cutaneous affections, and as a lubricant, was even more general and led to the raw material being an article of commerce at a still earlier date.

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  • An alternating current of one ampere is defined to be one which produces the same heat in a second in a wire as the unit continuous current defined as above to be one ampere.

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  • The soap is melted by heat, the glycerin is stirred in, and the mixture strained and poured into forms, in which it hardens but slowly into a transparent mass.

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  • In the more complex gases the specific heat varies considerably with temperature; only in the case of monatomic gases does it remain constant.

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  • This states that " the atomic heat (the product of the atomic weight and specific heat) of all elements is a constant quantity."

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  • He regarded these anomalies as solely due to the chemical nature of the elements, and ignored or regarded as insignificant such factors as the state of aggregation and change of specific heat with temperature.

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  • Since the atomic heat of the same element varies with its state of aggregation, it must be concluded that some factor taking this into account must be introduced; moreover, the variation of specific heat with temperature introduces another factor.

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  • We now proceed to discuss molecular heats of compounds, that is, the product of the molecular weight into the specific heat.

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  • Neumann, who, in 1831, deduced from observations on many carbonates (calcium, magnesium, ferrous, zinc, barium and lead) that stoichiometric quantities (equimolecular weights) of compounds possess the same heat capacity.

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  • Regnault confirmed Neumann's observations, and showed that the molecular heat depended on the number of atoms present, equiatomic compounds having the same molecular heat.

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  • Kopp systematized the earlier observations, and, having made many others, he was able to show that the molecular heat was an additive property, i.e.

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  • The specific heat of a compound may, in general, be calculated from the specific heats of its constituent elements.

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  • Conversely, if the specific heats of a compound and its constituent elements, except one, be known, then the unknown atomic heat is readily deducible.

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  • Similarly, by taking the difference of the molecular heats of compounds differing by one constituent, the molecular (or atomic) heat of this constituent is directly obtained.

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  • The specific heat of indium is o 057; and the atomic heats corresponding to the atomic weights 38, 76 and 114 are 3.2, 4.3, 6.5.

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  • As a general rule, compounds formed tive with a great evolution of heat have high boiling-points, and vice versa.

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  • In organic chemistry it is more customary to deal with the " heat of combustion," i.e.

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  • It follows that the true heat of combustion of carbon, i.e.

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  • Plus, they will be able to convert heat to electricity as well, so anything that heats up will become an energy source.

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  • The handle doesn't heat up.

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  • The heat makes Helen languid and quiet.

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  • He understood that latent heat (as they say in physics) of patriotism which was present in all these men he had seen, and this explained to him why they all prepared for death calmly, and as it were lightheartedly.

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  • The sun baked them with ever intensifying heat.

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  • Chauncey, you can't carry me in this heat.

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  • It wouldn't take long to dry in this heat.

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  • The best way to beat the cold was to work up some heat.

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  • Her senses became saturated quickly by his scent and heat.

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  • Deidre's face flushed with heat.

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  • Deidre approached him until close enough to feel his body heat.

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  • How is a sociopathic deity better at ruling the underworld than a compassionate human? he returned with no heat.

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  • I can turn the heat down and it will cook slower – might even be better.

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  • After he left, she turned the heat down and wrote a note to Jonathan.

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  • Most of them were wilting in the Atlanta heat.

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  • The air-conditioned hospital corridor gave way to the balmy heat of the Caribbean island on which he stood.

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  • Her sense of self-consciousness grew as the physical contact made her appreciative of the size and heat of his body.

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  • The heat of his body sank through her clothes, and the idea of his hot skin pressed to hers made her lower belly burn.

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  • His clothes were strangling him in heat after the match.

    1
    0
  • Her womanly scent teased him, the heat of her nearness reminding him of how he'd gotten himself into this situation in the first place.

    1
    0
  • His heat and scent were starting to mess with her at such a distance.

    1
    0
  • It was later than she thought, mid-afternoon by the heat.

    1
    0
  • Deidre's body betrayed her, giving a full-form shudder at the rush of heat and energy.

    1
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  • Deidre withdrew a few feet down the balcony, struggling with the heat streaking through her blood and scattering her rationale.

    1
    0
  • But Death on guard was something else entirely, and she wasn't going to be the second woman to revel in the heat of his arms this night.

    1
    0
  • Gradually, his warmth sank into her skin, and she lay still, exhausted yet soothed by the heat of his body.

    1
    0
  • Deidre gazed at the expanse of his chest, all too aware of his strength and heat.

    1
    0
  • Gabriel stopped in front of her, his heat and nearness like a subtle siren song that tried to lure her closer.

    1
    0
  • She let herself stay where she was, intrigued by the electricity and calmed by the heat of his body.

    1
    0
  • It gave off heat despite the black flames.

    1
    0
  • The vents rattled without producing heat.

    1
    0
  • The rocket slammed into an ambulance parked in front of Andre's, the brilliant explosion throwing heat and light that reached her on what she estimated was the twentieth floor.

    1
    0
  • Jessi leaned into him, thrilled at the sensation of his arms enveloping her in his heat.

    1
    0
  • The heat of combustion, as first determined by Julius Thomsen, agreed rather better with the presence of nine single unions.

    1
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  • Heat the substance on a piece of charcoal in the reducing flame of the blowpipe.

    1
    0
  • Another branch, related to energetics, is concerned with the transformation of chemical energy into other forms of energy - heat, light, electricity.

    1
    0
  • Specific Heat and Composition.-The nature and experimental determination of specific heats are discussed in the article Calorimetry; here will be discussed the relations existing between the heat capacities of elements and compounds.

    1
    0
  • In the article Thermodynamics it is shown that the amount of heat required to raise a given weight of a gas through a certain range of temperature is different according as the gas is maintained at constant pressure, the volume in creasing, or at constant volume, the pressure increasing.

    1
    0
  • This is the general equation for calculating the heat of combustion of a hydrocarbon.

    1
    0
  • It is remarkable that the difference in the heats of formation of ketones and the paraffin containing one carbon atom less is 67.94 calories, which is the heat of formation of carbon monoxide at constant volume.

    1
    0
  • It is remarkable that the position of the halogen in the molecule has no effect on the heat of formation; for example, chlorpropylene and allylchloride, and also ethylene dichloride and ethylidene dichloride, have equal heats of formation.

    1
    0
  • The density and specific heat of the tetragonal form are greater than those of the yellow.

    1
    0
  • In the interests of self-preservation against the world, the state and the heretics, the Christian communities had formed themselves into compact societies with a definite creed and constitution, and they felt that their existence was threatened by the white heat of religious subjectivity.

    1
    0
  • It was in far later periods and in other countries that the appearance of the dogstar was regarded as the signal of insufferable heat or prevalent disease.

    1
    0
  • In biological chemistry he worked at the problems of animal heat and at the phenomena accompanying the growth of plants, and he also devoted much time to meteorological questions and observations.

    1
    0
  • Four seasons are recognized - January - April, very dry and great heat; May - June, cooler and the " heavy " rains; July - September, the season of extreme heat and the south-west monsoon; October - December, the " light " rains.

    1
    0
  • In consequence of the elevation of the plateau and the dryness of the air, the heat is less oppressive than is indicated by the temperatures recorded.

    1
    0
  • A pupil of Nessus, or, as some accounts prefer, of Democritus himself, he was a complete sceptic. He accepted the Democritean theory of atoms and void and the plurality of worlds, but held a theory of his own that the stars are formed from day to day by the moisture in the air under the heat of the sun.

    1
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  • When the root-leaves and roots present any peculiarities, they should invariably be collected, but the roots should be dried separately in an oven at a moderate heat.

    1
    0
  • The tropical heat and humidity of Cuba make possible a flora of splendid richness.

    1
    0
  • The equability of heat throughout the day is masked and relieved by the afternoon sea breezes.

    1
    0
  • If the gas be mixed with the vapour of carbon disulphide, the mixture burns with a vivid lavender-coloured flame Nitric oxide is soluble in solutions of ferrous salts, a dark brown solution being formed, which is readily decomposed by heat, with evolution of nitric oxide.

    1
    0
  • The news of the affair of Sinope, rather wanton slaughter than a battle, Crimean raised excitement in England to fever heat; while War.

    1
    0
  • The drainage of the interior of Greenland is thus partly given off in the solid form of icebergs, partly by the melting of the snow and ice on the surface of the ice-cap, especially near its western margin, and to some slight extent also by the melting produced on its under side by the interior heat of the earth.

    1
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  • In the forcing of peaches fire heat is commonly applied about December or January; but it may, where there is a demand, begin a month sooner.

    1
    0
  • After the end of April little fire heat is required.

    1
    0
  • The excess of heat received in equatorial regions expands the water, but at the same time excess of evaporation concentrates it, so that the density increases.

    1
    0
  • In intermediate latitudes there is a loss of heat and then the increased density due to equatorial concentration becomes a factor.

    1
    0
  • Helland-Hansen and Nansen showed later that it was improbable that variations in the northerly drift of Atlantic water could be traced directly to variations in the quantity of heat received by the sea from solar radiation.

    1
    0
  • In one of the caves on the south coast the heat is still great, and on the eastern shore of the harbour there are hot sulphurous springs.

    1
    0
  • Albumins (as classified above) are soluble in water, dilute acids and alkalies, and in saturated neutral salt solutions; they are coagulated by heat.

    1
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  • Fibrin, produced from fibrinogen by a ferment, is a jelly-like substance, coagulable by heat, alcohol, &c. The muscle-albumins include " myosin " or paramyosinogen, a globulin, which by coagulation induces rigor mortis, and the closely related " myosinogen " or myogen; myoglobulin and myoalbumin are also found in muscles.

    1
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  • The primary products of the dissociation of albumins are the albumoses, characterized by not being coagulable by heat, more soluble than the albumins, having a far less complex composition, and capable of being " salted (7) out " by certain salts, and the peptones, similar to albumoses but not capable of being " salted out "; moreover, peptones are less complex than albumoses.

    1
    0
  • Acids and moist heat induce similar changes.

    1
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  • The mucins and mucoids belong to this group; they are acid and contain no phosphorus; they give the albumin colour reactions but are not coagulated by heat.

    1
    0
  • The higher ranges of the Elburz are snow-capped for the greater part of the year, and some, which are not exposed to the refracted heat from the arid districts of inner Persia, are rarely without snow.

    1
    0
  • If we take a thin layer of natural Canada balsam and heat it strongly for a little time most of the volatile oils are driven out of it.

    1
    0
  • The heat liberated, then, is almost exclusively that produced by the formation of water from its ions.

    1
    0
  • An exactly similar process occurs when any strongly dissociated acid acts on any strongly dissociated base, so that in all such cases the heat evolution should be approximately the same.

    1
    0
  • This is fully borne out by the experiments of Julius Thomsen, who found that the heat of neutralization of one gramme-molecule of a strong base by an equivalent quantity of a strong acid was nearly constant, and equal to 13,700 or 13,800 calories.

    1
    0
  • We can calculate the heat of formation from its ions for any substance dissolved in a given liquid, from a knowledge of the temperature coefficient of ionization, by means of an application of the well-known thermodynamical process, which also gives the latent heat of evaporation of a liquid when the temperature coefficient of its vapour pressure is known.

    1
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  • If the chemical changes which occur in the cell were allowed to take place in a closed vessel without the performance of electrical or other work, the change in energy would be measured by the heat evolved.

    1
    0
  • Since the final state of the system would be the same as in the actual processes of the cell, the same amount of heat must give a measure of the change in internal energy when the cell is in action.

    1
    0
  • Thus, if L denote the heat corresponding with the chemical changes associated with unit electric transfer, Le will be the heat corresponding with an electric transfer e, and will also be equal to the change in internal energy of the cell.

    1
    0
  • Similarly, the heat which accompanies the dissolution of one electrochemical unit of copper is 3.00 calories.

    1
    0
  • The efficacy of heat or of an acid, an alkali or other agent in promoting coagulation depends on the character of the latex, and varies with that obtained from different plants.

    1
    0
  • Another disadvantage of uncovered soil in a plantation of young rubber trees is that the ground under the heat of a tropical sun rapidly loses its moisture.

    1
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  • Caoutchouc is a bad conductor of heat and electricity, and alone or mixed with other materials is employed as an electrical insulator.

    1
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  • Before commencing the mastication it is generally necessary to warm the apparatus by means of steam; but as the operation proceeds the heat produced requires to be moderated by streams of cold water flowing through channels provided for the purpose.

    1
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  • To convert the masticated rubber into rectangular blocks, it is first softened by heat, and then forced into iron boxes or moulds.

    1
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  • Vulcanization is then effected by steam heat, and, the preparation on the cloth being softened by water, the sheet of rubber is readily removed.

    1
    0
  • When the vulcanization of rubber is carried too far, from the presence of a very large proportion of sulphur and an unduly long action of heat, the caoutchouc becomes hard, horn-like, and often black.

    1
    0
  • The micas are bad conductors of heat and electricity, and it is on these properties that many of their technical applications depend.

    1
    0
  • Being a bad conductor of heat it is used for the packing and jackets of boilers and steam-pipes.

    1
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  • Its foreshore consists of a great expanse of firm, bright sands, and the mildness of its winter climate is attributed to the radiation of heat from them.

    1
    0
  • Among other subjects at which he subsequently worked were the absorption of gases in blood (1837-1845), the expansion of gases by heat (1841-1844), the vapour pressures of water and various solutions (1844-1854), thermo-electricity (1851), electrolysis (1856), induction of currents (1858-1861), conduction of heat in gases (1860), and polarization of heat (1866-1868).

    1
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  • The heat is then raised in (relative) absence of air, when the two elements named unite into sulphur-dioxide, while a regulus of molten lead remains.

    1
    0
  • At this stage as a rule some rich slags of a former operation are added and a quantity of quicklime is incorporated, the chief object of which is to diminish the fluidity of the mass in the next stage, which consists in this, that, with closed air-holes, the heat is raised so as to cause the oxide and sulphate on the one hand and the sulphide on the other to reduce each other to metal.

    1
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  • Charcoal is now added, and the heat urged on to obtain Pressblei, an inferior metal formed partly by the action of the charcoal on the oxide of lead.

    1
    0
  • To remove tin, arsenic and antimony, the lead has to be brought up to a bright-red heat, when the air has a strongly oxidizing effect.

    1
    0
  • If the lead is to be liquated and then brought to a bright-red heat, both operations are carried on in the same reverberatory furnace.

    1
    0
  • After it has been melted down and brought to a red heat, the blast, admitted at the back, oxidizes the lead and drives the litharge formed towards the front, where it is run off.

    1
    0
  • In the reverberatory furnace, similar to the one used in softening, the lead is brought to a brightred heat and air allowed to have free access.

    1
    0
  • The conductivity for heat (Wiedemann and Franz) or electricity is 8.5, that of silver being taken as loo.

    1
    0
  • The specific heat is.

    1
    0
  • It is decomposed by heat into oxide, nitrogen peroxide and oxygen; and is used for the manufacture of fusees and other deflagrating compounds, and also for preparing mordants in the dyeing and calico-printing industries.

    1
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  • The heat of summer is most oppressive.

    1
    0
  • Plutarch (Cicero, 5) mentions it as reported of Aesopus, that, while representing Atreus deliberating how he should revenge himself on Thyestes, the actor forgot himself so far in the heat of action that with his truncheon he struck and killed one of the servants crossing the stage.

    1
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  • In order to attain this result it was formerly the practice to raise the metal to a bright red heat, and allow it to cool while carefully guarded from magnetic influence.

    1
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  • Fleming, it 47r requires about 18 foot-pounds of work to make a complete mag netic cycle in a cubic foot of wrought iron, strongly magnetized first one way and then the other, the work so expended taking the form of heat in the mass.

    1
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  • But when exceptionally strong fields are desired, the use of a coil is limited by the heating effect of the magnetizing current, the quantity of heat generated per unit of time in a coil of given dimensions increasing as the square of the magnetic field produced in its interior.

    1
    0
  • Abrupt alterations, take place in its density, specific heat, thermo-electric quality, electrical conductivity, temperature-coefficient of electrical resistance, and in some at least of its mechanical properties.

    1
    0
  • It is remarkable that if a flow of heat be substituted for a current of electricity a closely allied group of " thermo-magnetic effects " is presented.

    1
    0
  • Its touched eased the heat and pain.

    0
    0
  • When it'd finished, she felt little pain, and the heat was completely gone.

    0
    0
  • He certainly felt human with a massive male body expending heat and warmth.

    0
    0
  • The pinch was less today, and the pain gone instantly, replaced by heat and warmth.

    0
    0
  • His thumb traced the line of her jaw lightly, and heat skittered through her.

    0
    0
  • She felt the heat --his heat --within her, branding her from the inside out.

    0
    0
  • Katie supplied with no heat.

    0
    0
  • She surrendered to the heat in her blood.

    0
    0
  • If she stepped just an inch closer, she.d feel his body heat.

    0
    0
  • He turned her to face him, and she gazed up at him, once again awed by his size, heat, and intensity.

    0
    0
  • Her blood was already on fire from their bodies being pressed together, and heat pooled in the base of her belly.

    0
    0
  • He was trying not to let the feel of Katie.s skin heat his blood, but her nearness and direct gaze lit him afire.

    0
    0
  • Even at the safe distance, his body heat made her uncomfortably warm.

    0
    0
  • An unexpected heat jarred her to her core, and the earth beneath her feet shook violently enough to rattle her teeth.

    0
    0
  • The heat of his large hands made her feel as if she wore no clothing.

    0
    0
  • Heat flared within her body, and her imagination painted an image of the warrior before her without the clothing.

    0
    0
  • His incredible strength, heat, and scent calmed her fear as much as they excited the woman within her.

    0
    0
  • She could feel his body heat and felt pinned beneath the intensity of his gaze.

    0
    0
  • The landscape was open and flat, the heat making the ground shimmer.

    0
    0
  • She rose to see how far away they were from the horizon, miserable in the heat.

    0
    0
  • Night brought a chill as uncomfortable as the heat of the day.

    0
    0
  • The dwelling was warm already in the midmorning, and she wondered how she'd survive another day of heat like yesterday's.

    0
    0
  • Her senses filled with his taste, scent, the heat of his body, enveloping her yet never enough.

    0
    0
  • His large frame radiated heat.

    0
    0
  • The heat has been lowered now that the men have left and it is oh so cold as I lay huddled here beneath my thin blankets.

    0
    0
  • You mean you'd start blasting away on the spur of the moment— in the heat of passion.

    0
    0
  • Fully alert, he listened, but heard only night noises, the ticking of the hall clock, a slight breeze, the ever-present furnace rumbling heat to the old building.

    0
    0
  • She turned and in one motion straddled him, pinning his arms above his head, the heat of her body pressed against him.

    0
    0
  • With the first sip, heat invaded the newborns' throats and bellies.

    0
    0
  • The first was to maintain enough control to avoid crushing them in the heat of passion.

    0
    0
  • He decided that even if she sounded like a cat in heat, he would gush over her with praise.

    0
    0
  • I can heat some up for you.

    0
    0
  • The house looked so far away as it shimmered in heat waves.

    0
    0
  • Heat rolled over him as he was flung towards the weed-infested parking lot.

    0
    0
  • Heat pulsed off the building in waves, aided by a soft, cold breeze.

    0
    0
  • Heat then red light washed over them.

    0
    0
  • The body heat of someone kneeling beside her made her blink, and she braced herself for the doc shooting her up again.

    0
    0
  • She felt his body heat and stared at his wide chest.

    0
    0
  • Her breathing was hard, his body heat piercing her clothes.

    0
    0
  • Her face flamed with heat, and she strained against him.

    0
    0
  • She touched him timidly, her cool hands branding him as heat coursed through him.

    0
    0
  • Overwhelmed, she closed her eyes, enjoying the heat.

    0
    0
  • Heat ripped through the cabin of the helicopter, bringing with it the scent of scorched metal.

    0
    0
  • At least now they'll have real heat, she thought to herself.

    0
    0
  • Heat surged through his body, but he hesitated.

    0
    0
  • Deidre shifted with a grunt.  Katie sat back on her haunches, not sure what to do when she couldn't see what she was trying to cut.  Deidre was shaking as hard as Katie was, and Katie crept closer for body heat.

    0
    0
  • And then they got sick of sitting around, and maybe ran out of dough I guess and figured the heat was off, so they came out.

    0
    0
  • What's the heat if I double rent once in awhile?

    0
    0
  • The heat wouldn't let up.

    0
    0
  • That's a lot of heat for a lousy two or three million.

    0
    0
  • There was another concern—once the bikers hit the lower ele­vation and the heat of the afternoon, they would be shedding outer gear and perhaps identifying numbers with them.

    0
    0
  • It wouldn't take more than a few minutes in this heat before she would be ready to jump back into the water.

    0
    0
  • Below, the pond glistened in the evening heat, as if winking up at her.

    0
    0
  • You can get in out of the heat and you don't have to walk so far to do the chores.

    0
    0
  • Heat rushed up her neck.

    0
    0
  • The idea brought heat to her face.

    0
    0
  • Heat flooded her face and she looked away.

    0
    0
  • No more would she crawl between icy sheets and shiver until her own body heat warmed them - or wake to a cold lonely house.

    0
    0
  • Heat raced up her neck.

    0
    0
  • Heat raced up her neck again.

    0
    0
  • She started to groan with pleasure, but it came out more an eager whimper that sent a rush of heat to her face.

    0
    0
  • One evening Carmen prepared a nice supper and put it on low heat in the oven to keep it warm while she dressed.

    0
    0
  • If I heat this stuff up one more time, it's likely to get tough.

    0
    0
  • It was too late to heat up the oven and bake the chicken, so she cut it up and fried it.

    0
    0
  • He could heat it up if he wanted it.

    0
    0
  • He flipped on the heat and looked around the living room, satisfied with his find.

    0
    0
  • Jenn shivered involuntarily as a cool breeze replaced his body heat.

    0
    0
  • The dry desert heat gave way to cool sea breeze, and a massive apple tree protected her from the sun overhead.

    0
    0
  • She'd sparred with Darian hundreds of times and never noticed the way he smelled or the heat of his body against hers.

    0
    0
  • Her fingers continued, and he felt the heat of her touch like lightning running through his body.

    0
    0
  • The heat of the desert disappeared as he dropped through the portal to the immortal world.

    0
    0
  • At once, the cold and dark was replaced by soft light and heat.

    0
    0
  • She took a step back at the flash of heat.

    0
    0
  • Those ahead of him grew more restless with the passing time, eerie quiet, and stifling heat.

    0
    0
  • He heard nothing to indicate danger, but the heat grew steadily with their bodies pressed together.

    0
    0
  • The return journey must be undertaken soon, despite the heat and danger lurking in the forest.

    0
    0
  • The tension was thick, their heat filling the empty space between them.

    0
    0
  • Taran opened his eyes beneath the eye-band, the heat of a hot morning sun on his face.

    0
    0
  • She could not remember anything as comforting as his protective strength and heat.

    0
    0
  • She fluttered butterfly kisses across his face, thrilled at the heat and strength of his body so near hers.

    0
    0
  • Heat crawled up her neck.

    0
    0
  • It would be nice to try some of the camp recipes she had picked up before leaving California, but the kitchen was hot enough without adding cooking heat.

    0
    0
  • It was frozen, but it would soon thaw in this heat.

    0
    0
  • The heat of the sun had withered the cut foliage and it was unsightly.

    0
    0
  • She lifted the hair off the back of her neck and read on, but the sticky heat was too distracting.

    0
    0
  • The air was still and the heat stifling.

    0
    0
  • Even in the desert the heat had not been so oppressive... and one day it had reached over a hundred.

    0
    0
  • The heat was suffocating.

    0
    0
  • The warmth returned to his eyes, chasing a flood of heat up her throat.

    0
    0
  • Seriously, I don't know how you stand the heat.

    0
    0
  • I haven't yet, but then you're used to heat a lot worse than this, aren't you?

    0
    0
  • Probably something said in the heat of the moment.

    0
    0
  • Heat and exhaustion might have explained the instant fury that welled up in her throat and filled her voice with rancor.

    0
    0
  • Her head throbbed with the heat and she leaned it back on his shoulder.

    0
    0
  • His warm breath on her neck and the added heat of his body made her feel nauseous again.

    0
    0
  • Heat crept up his neck and into his face.

    0
    0
  • Xander asked with no real heat.

    0
    0
  • The air around him was strangely still, the heat of a body unlike any she'd ever seen before reminding her she hadn't dated in four years.

    0
    0
  • The heat of his large hands burned through her thin dress, and warmth bloomed within her.

    0
    0
  • Jessi fumbled with the lobster clasp on the black cord necklace, completely shaken by his size and heat.

    0
    0
  • He reached past her, his heat and scent stirring her senses once more.

    0
    0
  • She shivered at the sensation of his roughened jaw against her cheek and the heat of his bare chest.

    0
    0
  • The heat and size of his body, the erotic pose, his direct gaze … all fed the desire burning within her.

    0
    0
  • She gasped at the intensity that turned her lower belly into a furnace and swept through her, making her achingly aware of his scent, the heat and smoothness of his skin, the size of his body and the hot mouth pressed against her neck.

    0
    0
  • Her skin grew so sensitive, the scrape of sand and heat of his hands were almost orgasmic.

    0
    0
  • It was hard not to be affected by the strength and heat of his body or the fact she was way too close to him.

    0
    0
  • She backed away, too aware of the heat of his body and the strength it took to do what he'd done to the three thugs.

    0
    0
  • She found herself leaning into him, soothed by his size and the heat of the skin of his chest against her cheek.

    0
    0
  • She felt a hint of the trance she'd fallen into when he bit her, the coursing of desire and pooling of heat in her lower belly.

    0
    0
  • His scent and heat washed over her.

    0
    0
  • He stood close enough to feel her body heat and rested a hand on her hip as they waited for Ashley to unlock the door.

    0
    0
  • He began massaging gently, the combination of strength and heat welcome.

    0
    0
  • The Traveling was quick and transported them from the quiet, dry heat of Texas to the heavy, warm ocean air.

    0
    0
  • The heat of his bare chest beneath her hands and the hardness of his arousal against her belly made need roar to life within her.

    0
    0
  • Metallic cobalt may be obtained by reduction of the oxide or chloride in a current of hydrogen at a red heat, or by heating the oxalate, under a layer of powdered glass.

    0
    0
  • It decomposes steam at a red heat, and slowly dissolves in dilute hydrochloric and sulphuric acids, but more readily in nitric acid.

    0
    0
  • The beds are to be spawned when the heat moderates, and the surface is then covered with a sprinkling of warmed loam, which after a few days is made up to a thickness of 2 in., and well beaten down.

    0
    0
  • A fire without light, compared to the heat which gathers in a haystack when the hay has been stored before it was properly dry - heat, in short, as an agitation of the particles - is the motive cause of the contraction and dilatations of the heart.

    0
    0
  • It is not much comfort to learn further from Descartes that " he denies life to no animal, but makes it consist in the mere heat of the heart.

    0
    0
  • A part of the helium contained in minerals can be extracted by heat or by grinding.

    0
    0
  • The excessive heat of the upper regions compels him to descend, and he next visits the bottom of the sea in a kind of diving-bell.

    0
    0
  • There would then have been less disturbance owing to the breath of the players and heat of the theatres or concert-rooms. It would be a great advantage to get this higher grade generally adopted.

    0
    0
  • The object of all heating apparatus is the transference of heat from the fire to the various parts of the building it is intended to warm, and this transfer may be effected by radiation, by conduction or by convection.

    0
    0
  • A closed stove acts mainly by convection; though when heated to a high temperature it gives out radiant heat.

    0
    0
  • With closed stoves much less heat is wasted, and consequ;ntly less fuel is burned, than with open grates, but they often cause an unpleasant sensation of dryness in the air, and the products of combustion also escape to some extent, rendering this method of heating not only unpleasant but sometimes even dangerous.

    0
    0
  • They usually take the form of cast iron open stoves fitted with a number of Bunsen burners which heat perforated lumps of asbestos.

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  • If the flue pipe be carried up a considerable distance inside the apartment to be warmed before being turned into the external air, practically the whole of the heat generated will be utilized.

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  • Owing to the very rapid movement and the consequent increased rate of transmission of heat, the pipes and radiators may be reduced in size, in many circumstances a very desirable thing to achieve.

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  • If the weather is mild, a moderate heat may be obtained by using the apparatus as an ordinary hot water system, and shutting off the steam injectors.

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  • For large public buildings, factories, &c., heating by steam is generally adopted on account of the rapidity with which heat is available, and the great distance from the boiler at which warming is effected.

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  • It is certainly the most scientific method of steam-heating, and heat can be made to travel a greater distance by its aid than by any other means.

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  • The heat of the pipes is great, but can be easily regulated.

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  • This pumping action results in an extremely rapid circulation of the heating agent, enabling long distances to be traversed without much loss of heat.

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  • Compared with heating by hot water, steam-heating requires less piping, which, further, may be of much smaller diameter to attain a similar result, because of the higher temperature of the heat yielding surface.

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  • To regulate the heat it is necessary either to instal a number of small radiators or to divide the radiators into sections, each section controlled by distinct valves; steam may then be admitted to all the sections of the radiator or to any less number of sections as desired.

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  • Indirect radiators are placed beneath the floor of the apartment to be heated and give off heat through a grating.

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  • Fusible plugs are little used; they consist of pieces of softer metal inserted on the side of the boiler, which melt should the heat of the water rise above a certain temperature.

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  • The lime deposit or " fur " is a poor conductor of heat, and it is therefore most detrimental to the efficiency of the system to allow the interior of the boiler or any other portion to become furred up. Further, if not removed, the fur will in a short time bring about a fracture in the boiler.

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  • It does not react with the alkali metals, but combines with magnesium at a low red heat to form a boride, and with other metals at more or less elevated temperatures.

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  • It reduces many metallic oxides, such as lead monoxide and cupric oxide, and decomposes water at a red heat.

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  • Weber showed that the specific heat increases rapidly with increasing temperature.

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  • They present to the fierce play of the sun almost a level surface, so that during the day that surface becomes intensely heated and at night gives off its heat by radiation.

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  • This circumstance is due to the sea-breezes, which blow with great regularity, and temper what would otherwise be an excessive heat.

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  • Of course, in a territory of such large extent there are many varieties of climate, and the heat is greater along the coast than on the elevated lands of the interior.

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  • The heat, however, is generally less intense in summer, and the cold greater in winter.

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  • The chief complaint which Europeans make concerning it is the extreme humidity, which causes the heat to be more oppressive than is the case where the air is dry.

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  • He showed that the heat motion of particles, which is too small to be perceptible when these particles are large, and which cannot be observed in molecules since these themselves are too small, must be perceptible when the particles are just large enough to be visible and gave complete equations which enable the masses themselves to be deduced from the motions of these particles.

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  • There was, however, even before Newton's time, more than a suspicion that heat was a form of energy.

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  • Francis Bacon expressed his conviction that heat consists of a kind of motion or "brisk agitation" of the particles of matter.

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  • It must not be thought that heat generates motion or motion heat (though in some respects this is true), but the very essence of heat, or the substantial self of heat, is motion and nothing else."

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  • Rumford was engaged in superintending the boring of cannon in the military arsenal at Munich, and was struck by the amount of heat produced by the action of the boring bar upon the brass castings.

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  • In order to see whether the heat came out of the chips he compared the capacity for heat of the chips abraded by the boring bar with that of an equal quantity of the metal cut from the block by a fine saw, and obtained the same result in the two cases, from which he concluded that "the heat produced could not possibly have been furnished at the expense of the latent heat of the metallic chips."

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  • In order to be sure that the heat was not due to the action of the air upon the newly exposed metallic surface, the cylinder and the end of the boring bar were immersed in 18-77 lb.

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  • Taking into account the heat absorbed by the box and the metal, Rumford calculated that the heat developed was sufficient to raise 26.58 lb of water from the freezing to the boiling point, and in this calculation the heat lost by radiation and conduction was neglected.

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  • Finally, Rumford reviewed all the sources from which the heat might have been supposed to be derived, and concluded that it was simply produced by the friction, and that the supply was inexhaustible.

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  • He did not, however, infer that since the heat could not have been supplied by the ice, for ice absorbs heat in melting, this experiment afforded conclusive proof against the substantial nature of heat.

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  • Though we may allow that the results obtained by Rumford and Davy demonstrate satisfactorily that heat is in some way due to motion, yet they do not tell us to what particular dynamical quantity heat corresponds.

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  • For example, does the heat generated by friction vary as the friction and the time during which it acts, or is it proportional to the friction and the distance through which the rubbing bodies are displaced - that is, to the work done against friction - or does it involve any other conditions?

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  • P. Joule to achieve; his experiments conclusively prove that heat and energy are of the same nature, and that all other forms of energy can be transformed into an equivalent amount of heat.

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  • He argued that, if heat be energy, then, when it is employed in doing work, as in a steam-engine, some of the heat must itself be consumed in the operation.

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  • Hence he inferred that the amount of heat given up to the condenser of an engine when the engine is doing work must be less than when the same amount of steam is blown through the engine without doing any work.

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  • Him succeeded, not only in showing that such a difference exists, but in measuring it, and hence determining a tolerably approximate value of the mechanical equivalent of heat.

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  • In 1839 Seguin endeavoured to determine the mechanical equivalent of heat from the loss of heat suffered by steam in expanding, assuming that the whole of the heat so lost was consumed in doing external work against the pressure to which the steam was exposed.

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  • Mayer made an assumption the converse of that of Seguin, asserting that the whole of the work done in compressing the air was converted into heat, and neglecting the possibility of heat being consumed in doing work within the air itself or being produced by the transformation of internal potential energy.

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  • By ca-sing two conical surfaces of cast-iron immersed in mercury and contained in an iron vessel to rub against one another when pressed together by a lever, Joule obtained 776.045 foot-pounds for the mechanical equivalent of heat when the heavy weights were used, and 774.93 foot-pounds with the small driving weights.

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  • The close agreement between the results at least indicates that "the amount of heat produced by friction is proportional to the work done and independent of the nature of the rubbing surfaces."

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  • Joule inferred from them that the mechanical equivalent of heat is probably about 772 foot-pounds, or, employing the centigrade scale, about 1390 foot-pounds.

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  • He also determined a roughly approximate value for the mechanical equivalent of heat from the results of these experiments.

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  • Now, we know that the number of electrochemical equivalents electrolysed is proportional to the whole amount of electricity which passed through the circuit, and the product of this by the electromotive force of the battery is the work done by the latter, so that in this case also Joule showed that the heat generated was proportional to the work done.

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  • Assuming that the whole of the energy was converted into heat, when the air was subjected to a pressure of 21.5 atmospheres Joule obtained for the mechanical equivalent of heat about 824.8 foot-pounds, and when a pressure of only 10 .

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  • The amount of heat absorbed by the air could thus be measured, while the work done by it in expanding could be readily calculated.

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  • In allowing the air to expand from a pressure of 21 atmospheres to that of i atmosphere the value of the mechanical equivalent of heat obtained was 821.89 foot-pounds.

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  • On repeating the experiment when the two vessels were placed in different calorimeters, it was found that heat was absorbed by the vessel containing the compressed air, while an equal quantity of heat was produced in the calorimeter containing the exhausted vessel.

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  • For a long time the final result deduced by Joule by these varied and careful investigations was accepted as the standard value of the mechanical equivalent of heat.

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  • Though we can convert the whole of the energy possessed by any mechanical system into heat, it is not in our power to perform the inverse operation, and to utilize the whole of the heat in doing mechanical work.

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  • Thus the principle of Carnot involves the conclusion that a greater proportion of the heat possessed by a body at a high temperature can be converted into work than in the case of an equal quantity of heat possessed by a body at a low temperature, so that the availability of heat increases with the temperature.

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  • By continuing this process every unit of mass which enters B will carry with it more energy than each unit which leaves B, and hence the temperature of the gas in B will be raised and that of the gas in A lowered, while no heat is lost and no energy expended; so that by the application of intelligence alone a portion of gas of uniform pressure and temperature may be sifted into two parts, in which both the temperature and the pressure are different, and from which, therefore, work can be obtained at the expense of heat.

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  • In the preface he states the position that "whenever, then, two gases are allowed to mix without the performance of work, there is dissipation of energy, and an opportunity of doing work at the expense of low temperature heat has been for ever lost."

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  • When the pressure on one side of the diaphragm thus becomes greater than that on the other, work may be done at the expense of heat in pushing the diaphragm, and the operation carried on with continual gain of work until the gases are uniformly diffused.

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  • This sorting can occur spontaneously to a limited extent; while if we could carry it out as far as we pleased we might transform the whole of the heat of a body into work.

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  • If we could drive the engine so fast as to reduce C' to zero, the whole of the energy of the battery would be available, no heat being produced in the wires, but the horse-power of the engine would be indefinitely small.

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  • The availability of the energy of magnetization is limited by the coercive force of the magnetized material, in virtue of which any change in the intensity of magnetization is accompanied by the production of heat.

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  • When electric oscillations are set up in an open or closed electric circuit having capacity and inductance, and left to themselves, they die away in amplitude, either because they dissipate their energy as heat in overcoming the resistance of the circuit, or because they radiate it by imparting wave motion to the surrounding ether.

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  • A fourth class of electric wave detector comprises the thermal detectors which operate in virtue of the fact that electric oscillations create heat in a fine wire through which they pass.

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  • It does not melt at a white heat, and is easily reduced to the metal by heating in a current of hydrogen or with carbon.

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  • It is decomposed by heat into the oxide and water, and is soluble in ammonia but not in excess of dilute potassium hydroxide; this latter property serves to distinguish it from zinc hydroxide.

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  • It is used as a pigment (cadmium yellow), for it retains its colour in an atmosphere containing sulphuretted hydrogen; it melts at a white heat, and on cooling solidifies to a lemon-yellow micaceous mass.

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  • The inhabitants of the north—the Piedmontese, Lombards and Genoese especially—have suffered less than those of the rest of the peninsula from foreign domination and from the admixture of inferior racial elements, and the cold winter climate prevents the heat of summer from being enervating.

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  • By this writer the world is explained as a product of three principles - dead matter, and two active forces, heat and cold.

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  • Terrestrial things arise through a confluence of heat, which issues from the heavens, and cold, which comes from the earth.

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  • It is a white powder, which turns pale yellow on heating, and melts at a red heat.

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  • The latter function has been found to be of extreme importance in the case of plants exposed to the direct access of the suns rays, the heat of which would rapidly cause the death of the protoplasts were it not employed in the evaporation of the water.

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  • Though this at first met with some acceptance, Strasburger showed that the action goes on in great lengths of stem the cells of which have been killed by poison or by the action of heat.

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  • Again, we have evidence of the power of plants to avail themselves of the heat rays.

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  • There is, no doubt, a direct interchange of heat between the plant and the air, which in many cases results in a gain of heat by the plant.

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  • Indeed, the tendency to absorb heat in this way, either from the air or directly from the sunlight, has already been pointed out as a danger which needs to be averted by transpiration.

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  • The liberated energy takes the form of heat, which raises the temperature of the fermenting wort.

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  • In species of Eucalyptus, the leaves are placed edge-wise to the incident rays of light and heat.

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  • The sieve tubes contain a thin lining layer of protoplasm on their walls, but no nuclei, and the cell sap contains albuminous substances which are coagulable by heat.

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  • The boreal is cold, the austral warm, and the tropical affords conditions of heat and moisture to which the vegetation of the others would be intolerant.

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  • Arctic plants make their brief growth and flower at a temperature little above freezing-point, and are dependent for their heat on the direct rays of the sun.

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  • Aristotle, too, gave greater definiteness to the idea of zones conceived by Parmenides, who had pictured a torrid zone uninhabitable by reason of heat, two frigid zones uninhabitable by reason of cold, and two intermediate temperate zones fit for human occupation.

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  • On all sides there was danger and revolt, even Baber's own soldiers, worn out with the heat of this new climate, longed for Kabul.

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  • The colour of amethyst is usually attributed to the presence of manganese, but as it is capable of being much altered and even discharged by heat it has been referred by some authorities to an organic source.

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  • On exposure to heat, amethyst generally becomes yellow, and much of the cairngorm or yellow quartz of jewellery is said to be merely "burnt amethyst."

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  • Each August, despite the heat, representatives from the 60 (or 64) tribes of Gallia Comata met at Lyons, elected a priest, "sacerdos ad aram Augusti et Romae," and held games.

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  • Climate.-Uruguay enjoys the reputation of possessing one of the most healthy climates in the world The geographical position ensures uniformity of temperature throughout the year, the summer heat being tempered by the Atlantic breezes, and severe cold in the winter season being unknown.

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  • In the simplest and crudest method, as practised in Sicily, a mass of the ore is placed in a hole in the ground and fired; after a time the heat melts a part of the sulphur which runs down to the bottom of the hole and is then ladled out.

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  • The pyrites is subjected to dry distillation from out of iron or fire-clay tubular retorts at a bright red heat.

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  • The precipitate is washed, collected, and dried at a very moderate heat.

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  • The density of solid sulphur is 2 062 to 2'070, and the specific heat 0.1712; it is a bad conductor of electricity and becomes negatively electrified on friction.

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  • When perfectly dry this oxide has no caustic properties; it combines rapidly, however, with water to form sulphuric acid, with the development of much heat.

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  • In both states, the Commissions have power over electric railways and local public utilities furnishing heat, light and power, as well as over steam railway transportation, and the Wisconsin Commission also has control over telephone companies.

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  • It has been proposed to adopt the joule, with the symbol j, as thermochemical unit for small quantities of heat, large amounts being expressed in terms of the kilojoule, Kj =100o j.

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  • The summer heat is moderated by the sea-breeze or by cool northerly winds from the mountains (especially in July and August).

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  • In the autumn months malarial fever is prevalent in all thickly forested tracts and also in the rice country; but on the whole the province is considered to be healthy, and as the rains break fairly regularly in June and produce an immediate fall in the temperature, severe heat is only experienced for a period of from two to three months.

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  • For example, the physicist determines the density, elasticity, hardness, electrical and thermal conductivity, thermal expansion, &c.; the chemist, on the other hand, investigates changes in composition, such as may be effected by an electric current, by heat, or when two or more substances are mixed.

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  • Mitscherlich in 1820; and he confirmed his conclusions by showing the agreement with the law of atomic heat formulated by Dulong and Petit in 1819.

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  • Elements which readily enter into reaction with each other, and which develop a large amount of heat on combination, are said to have a powerful affinity for each other.

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  • In all cases of chemical change energy in the form of heat is either developed or absorbed, and the amount of heat developed or absorbed in a given reaction is as definite as are the weights of the substance engaged in the reaction.

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  • We may suppose that in the formation of gaseous hydrochloric acid from gaseous chlorine and hydrogen, according to the equation H2 +C1 2 = HCI+HC1, a certain amount of energy is expended in separating the atoms of hydrogen in the hydrogen molecule, and the atoms of chlorine in the chlorine molecule, from each other; but that heat is developed by the combination of the hydrogen atoms with the chlorine atoms, and that, as more energy is developed by the union of the atoms of hydrogen and chlorine than is expended in separating the hydrogen atoms from each other and the chlorine atoms from one another, the result of the action of the two elements upon each other is the development of heat, - the amount finally developed in the reaction being the difference between that absorbed in decomposing the elementary molecules and that developed by the combination of the atoms of chlorine and hydrogen.

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  • In the formation of gaseous hydrobromic acid from liquid bromine and gaseous hydrogen H2+Br2=HBr+HBr, in addition to the energy expended in decomposing the hydrogen and bromine molecules, energy is also expended in converting the liquid bromine into the gaseous condition, and probably less heat is developed by the combination of bromine and hydrogen than by the combination of chlorine and hydrogen, so that the amount of heat finally developed is much less than is developed in the formation of hydrochloric acid.

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  • Lastly, in the production of gaseous hydriodic acid from hydrogen and solid iodine H2 - 1 - 12=HI+HI, so much energy is expended in the decomposition of the hydrogen and iodine molecules and in the conversion of the iodine into the gaseous condition, that the heat which it may be supposed is developed by the combination of the hydrogen and iodine atoms is insufficient to balance the expenditure, and the final result is therefore negative; hence it is necessary in forming hydriodic acid from its elements to apply heat continuously.

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  • These compounds also afford examples of the fact that, generally speaking, those compounds are most readily formed, and are most stable, in the formation of which the most heat is developed.

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  • When two substances which by their action upon each other develop much heat enter into reaction, the reaction is usually complete without the employment of an excess of either; for example, when a mixture of hydrogen and oxygen, in the proportions to form water 2E12+0, =20H2, is exploded, it is entirely converted into water.

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  • Hittorf, who carefully investigated the effects produced by heat; crystalline selenium possesses a very striking property, viz.

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  • It is well known that singly, doubly and trebly linked carbon atoms affect the physical properties of substances, such as the refractive index, specific volume, and the heat of combustion; and by determining these constants for many substances, fairly definite values can be assigned to these groupings.

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  • Stohmann of Leipzig; and the new data and the conclusions to be drawn from them formed the subject of much discussion, Briihl endeavouring to show how they supported Kekule's formula, while Thomsen maintained that they demanded the benzene union to have a different heat of combustion from the acetylene union.

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  • Towards the end the heat and the oxygen supply are increased.

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  • The platinum is maintained at a bright red heat, either by a gas flame or by an electric furnace, and the vapour is passed over it by leading in a current of oxygen.

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  • Combustion is a familiar example of the transformation of chemical energy into heat and light; the quantitative measures of heat evolution or absorption (heat of combustion or combination), and the deductions therefrom, are treated in the article Thermochemistry.

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  • In the first case the thermal effect of 58.58 calories actually observed must be increased by 2d to allow for the heat absorbed in splitting off two gramme-atoms of carbon; in the second case the thermal effect of 96.96 must be increased by d as above.

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  • Theabsolute heat of combustion of a carbon atom is therefore 135.34 calories, and this is independent of the form of the carbon burned.

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  • Then the number of single bonds is 2n - m-2p, and the heat of combustion becomes H,=nE+m77+p(2X - Y).

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  • The thermal effect of the " alcohol " group C. OH may be determined by finding the heat of formation of the alcohol and subtracting the thermal effects of the remaining linkages in the molecule.

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  • When solid caoutchouc is strongly heated it breaks down, without change in its ultimate composition, into a number of simpler liquid hydrocarbons of the terpene class (dipentene, di-isoprene, isoprene, &c.), of which one, isoprene (C5H8), is of simpler structure than oil of turpentine (C 10 H 16), from which it can also be obtained by the action of an intense heat.

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  • The mixed rubber thus obtained is readily softened by heat, and can be very easily worked into any desired form or rolled into sheets by an apparatus known as the calendering machine.

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  • Air goods, such as cushions, beds, gas bags, and so forth, are made of textile fabrics which have been coated with mixed rubber either by the spreading process above described, or by means of heated rollers, the curing being then effected by steam heat.

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