It is the viscous or graisse disease.
free from bubbles, it is allowed to cool down to a certain extent so as to become viscous or pasty.
The solid melts to a pale yellow liquid which on continued heating gradually darkens and becomes more viscous, the maximum viscosity occurring at 180°, the product being dark red in colour.
Liquid selenium becomes more and more viscous in character as its temperature falls from 220° C. to 60° C.; it is soft at about 60°, but is hard and brittle between 30° and 40°.
The more viscous descriptions of mineral oils have also been found suitable for use in the Elmore process of ore-concentration by oil.
A mass of glass in a viscous state can be rolled with an iron roller like dough; can be rendered hollow by the pressure of the human breath or by compressed air; can be forced by air pressure, or by a mechanically driven plunger, to take the shape and impression of a mould; and can be almost indefinitely extended as solid rod or as hollow tube.
As the larva approaches maturity these vessels become gorged with a clear viscous fluid, which, upon being exposed to the air immediately hardens to a solid mass.
Certain nerve fibres from the sympathetic nervous system, which can also cause the secretion of a (specially viscous) saliva, are entirely unaffected by atropine.
The pressure causes the soft metal to flow like a viscous solid, but its lateral escape is prevented by a collar which surrounds the blank while it is being struck.
Some of the more viscous crude oils obtained in the United States are employed as lubricants under the name of " natural oils," either without any treatment or after clarification by subsidence and filtration through animal charcoal.
In the viscous state a mass of glass can be coiled upon the heated end of an iron rod, and if the rod is hollow can be blown into a hollow bulb.
When this is the case the gathering is carried to a block or half-open mould in which it is rolled and blown until it acquires, roughly, the shape of a hemisphere, the flat side being towards the pipe and the convexity away from it; the diameter of this hemisphere is so regulated as to be approximately that of the cylinder which is next to be formed of the viscous mass.
Yet frothing is not excessive, because the slag is not, as in common practice, locally chilled and made viscous by cold lumps of ore.
The smooth surface of the viscous billowy lava is further diversified by long twisted " ropes," curving backwards and forwards up and down the undulations.
The opening of the mouth is small, and from it the echidna puts forth its long slender tongue, lubricated with a viscous secretion, by means of which it seizes the ants and other insects on which it feeds.
If the viscous variety be rapidly cooled, or the more highly heated mass be poured into water, an elastic substance is obtained, termed plastic sulphur.
Persulphuric anhydride, S207, is a thick viscous liquid obtained by the action of the silent discharge upon a mixture of sulphur trioxide and oxygen.
This viscous liquid is present in small proportion in some commercial rubbers owing to overheating during their preparation.
A flattened cake of viscous glass-enamel is welded on to one side of the mass of glass after it has been hollowed by blowing.
The viscous mass having been thrown on the casting-table, a large and heavy roller passes over it and spreads it out into a sheet.
Every solid substance is found to be plastic more or less, as exemplified by punching, shearing and cutting; but the plastic solid is distinguished from the viscous fluid in that a plastic solid requires a certain magnitude of stress to be exceeded to make it flow, whereas the viscous liquid will yield to the slightest stress, but requires a certain length of time for the effect to be appreciable.
As liquidity might be looked upon as the ne plus ultra of softness, this is the right place for stating that, while most metals, when heated up to their melting points, pass pretty abruptly from the solid to the liquid state, platinum and iron first assume, and throughout a long range of temperatures retain, a condition of viscous semi-solidity which enables two pieces of them to be "welded" together by pressure into one continuous mass.
It is almost colourless and has a small coefficient of expansion; its hygroscopic properties, its viscous character, and its action on the skin, however, militate against its use.
These crystallites (q.v.) show that the glassy rock has a tendency to crystallize which is inhibited only by the very viscous state of the glass and the rapidity with which it was cooled.
But when the smallest stress, if only continued long enough, will cause a perceptible and increasing change of form, the substance must be regarded as a viscous fluid, however hard it may be."
His observations led him to the view that a glacier is an imperfect fluid or a viscous body which is urged down slopes of a certain inclination by the mutual pressure of its parts, and involved him in some controversy with Tyndall and others both as to priority and to scientific principle.
There is no " transverse " disturbance, that is, there is in air no motion across the line of propagation, for such motion could only be propagated from one layer to the next by the " viscous " resistance to relative motion, and would die away at a very short distance from the source.
Again, it is well known that in the case of the viscous disease the difficulty may be overcome by the addition of a small quantity of tannin.
The ice-cap of Greenland must to some extent be considered as a viscous mass, which, by the vertical pressure in its interior, is pressed outwards and slowly flows towards the coasts, just as a mass of pitch placed on a table and left to itself will in the course of time flow outwards towards all sides.
As the rock was highly viscous and the surface over which it moved was often irregular the motion was disturbed and fluctuating; hence the sinuous and contorted appearance frequently assumed by the banding.
They pass through a viscous stage in cooling from a state of fluidity; they develop effects of colour when the glass mixtures are fused with certain metallic oxides; they are, when cold, bad conductors both of electricity and heat, they are easily fractured by a blow or shock and show a conchoidal fracture; they are but slightly affected by ordinary solvents, but are readily attacked by hydrofluoric acid.
The whole pot, with its contents of viscous glass, is then removed bodily from the furnace by means of huge tongs and is transported to a crane, which grips the pot, raises it, and ultimately tips it over so as to pour the glass upon the slab of the rolling-table.
The stirring process is begun when the glass is perfectly fluid at a temperature little short of the highest attained in its fusion, but as the stirring proceeds the glass is allowed to cool gradually and thus becomes more and more viscous until finally the stirring cylinder can scarcely be moved.
As far as the order to which he carried the approximations - which, however, were based on a simplifying hypothesis that the molecules influenced each other through mutual repulsions inversely as the fifth power of their distance apart--the result was that the equations of motion of the gas, considered as subject to viscous and thermal stresses, could be satisfied by a state of equilibrium under a modified internal pressure equal in all directions.
Gear Driven Chain Oil Pump - chain oil is quite viscous, mechanical feed ensures a positive delivery.
The basic lavas are usually darker and denser than lavas of acid type, and when fused they tend to flow to great distances, and may thus form far-spreading sheets, whilst the acid lavas, being more viscous, rapidly consolidate after extrusion.
But immediately above this level the charge is relatively viscous, because here the temperature has fallen so far that it is now at the melting or formation point of the slag, which therefore is pasty, liable to weld the whole mass together es so much tar would, and thus to obstruct the descent of the charge, or in short to " scaffold."
A cold lump of ore chills the slag immediately around it, just where its oxygen, reacting on the carbon of the metal, generates carbonic oxide; the slag becomes cool, viscous, and hence easily made to froth, just where the froth-causing gas is evolved.
Asphalt, whether a natural product or artificially obtained, as, for example, in some chemical manufactures, is a most useful material if properly employed in connexion with reservoir dams. Under sudden impact it is brittle, and has a conchoidal fracture like glass; but under continued pressure it has the properties of a viscous fluid.
But given time, all such compounds, if they contain enough bitumen to render them water-tight, appear to settle down even at ordinary temperatures as heavy viscous fluids, retaining their fluidity permanently if not exposed to the air.
In his eighteenth year, while still a student in Edinburgh, he contributed two valuable papers to the Transactions of the same society - one of which, " On the Equilibrium of Elastic Solids," is remarkable, not only on account of its intrinsic power and the youth of its author, but also because in it he laid the foundation of one of the most singular discoveries of his later life, the temporary double refraction produced in viscous liquids by shearing stress.
There must, then, be a relation between the rate of change of the concentration and the osmotic pressure gradient, and thus we may consider the osmotic pressure gradient as a force driving the solute through a viscous medium.
At about 150 0 -200° C. caoutchouc melts, forming a viscous liquid which does not solidify on cooling.
At higher temperatures the viscous liquid suffers decomposition with the formation of various liquid hydrocarbons, principally members of the terpene series.
So extensible is viscous glass that it can be drawn out into a filament sufficiently fine and elastic to be woven into a fabric.
The tools used are extremely primitive - hollow iron blowing-rods, solid rods for holding vessels during manipulation, spring tools, resembling sugar-tongs in shape, with steel or wooden blades for fashioning the viscous glass, callipers, measure-sticks, and a variety of moulds of wood, carbon, cast iron, gun-metal and plaster of Paris (figs.
It is a curious property of viscous glass that whatever form is given to the mass of glass before it is drawn out is retained by the finished cane or tube, however small its section may be.
that of helping the thin viscous threads through their final outlets, and the adhesion of the two filaments when brought into contact with the atmosphere.
But while Forbes asserted that ice was viscous, Tyndall denied it, and insisted, as the result of his observations, on the flow being due to fracture and regelation.
All agreed that ice flowed as if it were a viscous fluid; and of this apparent viscosity James Thomson offered an independent explanation by the application of pure thermodynamical theory, which Tyndall considered inefficient to account for the facts he observed.
Before work begins the temperature is lowered sufficiently to render the glass viscous.
A fluid is a substance which yields continually to the slightest tangential stress in its interior; that is, it can be divided very easily along any plane (given plenty of time if the fluid is viscous).
Slough The term for the viscous yellow layer which often covers the wound and is strongly adherent to it.
amorphous hydrogels also contain other ingredients, making them more viscous.
These foods often produce very viscous intragastric chyme and this program is designed to find out how the stomach deals with such food.
Subject: viscous coupling Posted on: 04/09/2006 How do you determine if the fan viscous coupling is done for?
Damping is included by attaching a viscous damper to the mass.
The practically important effects of viscous dissipation have been taken into account.
Bitumen Also called asphalt or tar, bitumen is the brown or black viscous residue from the vacuum distillation of crude petroleum.
The must be sufficient grease to ensure the gear teeth are lubricated but an excess can result in viscous drag and power losses.
Complex tectonic and volcanic forces involving icy viscous fluids combined to develop the deformed pattern of this landscape.
immersed in viscous silicone fluid, a ' glue ' which helps transmit torque to the output side.
incompressible flows: viscous flow will be the subject of later modules.
More viscous liquids will require a longer draining time, less viscous liquids may over-deliver in the quoted time.
No evidence of Kelvin-Helmholtz waves at the dayside or flank magnetopause, nor viscous interaction, was found in this simulation.
The image on the left shows a snapshot of a 30 earth mass protoplanet embedded in a viscous, laminar disk model.
Firstly, the final product is a viscous paste which exhibits complex rheology, in particular irreversible thixotropy.
Many materials behave both like elastic solids and viscous fluids, a phenomenon referred to as viscoelastic properties.
The plates are all immersed in viscous silicone fluid, a ' glue ' which helps transmit torque to the output side.
transonic wings, however an increase in viscous drag was also observed.
The prime candidate is the viscous resistance -- the force that makes it difficult to stir treacle.
A blast of warm air can makes the resin less viscous an easier to apply.
viscous damper to the mass.
viscous dissipation have been taken into account.
viscous fluid encased in a tough, flexible membrane.
To a plankton animal smaller than a grain of rice, water is a highly viscous medium.
The very viscous " Jurassic Gel " is particularly useful for filling in larger cracks.
not all alloys are possible (some are not viscous enough ).
Unless the metal is sufficiently viscous at its melting temperature, the foam will collapse before solidification.
At a low temperature the product may become viscous.
long, obovate-lanceolate in shape and yellowish-green; the dioecious flowers, which are small and nearly of the same colour but,yellower, appear in February and March; the white berry when ripe is filled with a viscous semitransparent pulp (whence bird-lime is derived).
The solid melts to a pale yellow liquid which on continued heating gradually darkens and becomes more viscous, the maximum viscosity occurring at 180Ã‚°, the product being dark red in colour.
20, 451, 757) regards molten sulphur as a mixture of two isomers SA and Sµ in dynamic equilibrium, SA being light in colour and mobile, and S, dark and viscous.
At about 150 0 -200Ã‚° C. caoutchouc melts, forming a viscous liquid which does not solidify on cooling.
The gatherer dips the butt of the pipe into the molten " metal " and withdraws upon it a small ball of viscous glass, which he allows to cool in the air while constantly rotating it so as to keep the mass as nearly spherical in shape as he can.
The theorems of hydrostatics are thus true for all stationary fluids, however, viscous they may be; it is only when we come to hydrodynamics, the science of the motion of a fluid, that viscosity will make itself felt and modify the theory; unless we begin by postulating the perfect fluid, devoid of viscosity, so that the principle of the normality of fluid pressure is taken to hold when the fluid is in movement.
If this could be co-ordinated and utilized without dissipation, the gas might conceivably be restored to its initial state; but in practice violent local differences of pressure and temperature are produced, the kinetic energy is rapidly converted into heat by viscous eddy friction, and residual differences of temperature are equalized by diffusion throughout the mass.
(See Ex Plosives.) The explosive cordite is adopted in the British service; it derives the name from its appearance as cord in short lengths, the composition being squeezed in a viscous state through the hole in a die, and the cordite is designated in size by the number of hundredths of an inch in the diameter of the hole.
Liquid selenium becomes more and more viscous in character as its temperature falls from 220Ã‚° C. to 60Ã‚° C.; it is soft at about 60Ã‚°, but is hard and brittle between 30Ã‚° and 40Ã‚°.
R.C.A. Hindmarsh (1997), Deforming beds: viscous and plastic scales of deformation of subglacial sediment ' ', Quat.
Findings indicated a possible reduction of wave drag for transonic wings, however an increase in viscous drag was also observed.
A study of highly viscous, two-phase flow in pipe line systems has been initiated.
Our results have appeared in four key papers, taking the analysis through increasingly complex flows for both viscous and viscoelastic fluids.
It also has less charge, is less reactive and more viscous than bulk water.
The bubbles then rest within a viscous fluid encased in a tough, flexible membrane.
A tanker on Wessex Way has been seen leaking a brown, viscous liquid.
Why is viscous drag said to be proportional to velocity?
Not all alloys are possible (some are not viscous enough).
A thick viscous gel fills the center of each leaf of an aloe plant.
The easiest surfacing compound to apply is a viscous, premixed paste.
Luscious and viscous and syrupy in texture, it lingers on the palate for 10 seconds on the aftertaste.
The wines are slightly viscous and sweet, with coffee or caramel undertones.
Viscous wines are full-bodied and dense.
Wines described as viscous are also well balanced with very intense flavors.
Medicines that numb the mouth, like viscous lidocaine or topical anesthetics only last for a brief time and, by numbing the mouth, may cause your child to further injure damaged tissues without knowing it.
For most women, the vaginal secretions during ovulation will alter and become sticky, creamy and viscous, whereas at other times of the cycle it may be watery and much clearer, or not be present at all.
The standard aromatherapy carrier oils such as sweet almond, grape seed, or olive oil are too viscous to be useful in helping the reeds absorb the fragrance.
viscous than bulk water.
viscous drag said to be proportional to velocity?
But this is to avoid the tedium; such candidate lists are just too viscous.
Old trees are selected, from the bark of which it is observed to ooze in the early summer; holes are bored in the trunk, somewhat inclined upward towards the centre of the stem, in which, between the layers of wood, the turpentine is said to collect in small lacunae; wooden gutters placed in these holes convey the viscous fluid into little wooden pails hung on the end of each gutter; the secretion flows slowly all through the summer months, and a tree in proper condition yields from 6 to 8 Ib a year, and will continue to give an annual supply for thirty or forty years, being, however, rendered quite useless for timber by subjection to this process.
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