Its fires are not volcanic, but result from the combustion of coal some distance underground, giving off much smoke and steam; geologists estimate that the burning has been going on for at least 800 years.
SULPHUR [[[symbol]] S, atomic weight 32.07 (0 = 16)], a non-metallic chemical element, known from very remote times and regarded by the alchemists, on account of its inflammable nature, as the principle of combustion; it is also known as brimstone.
By the combustion of the least sufficient quantity of sulphur, the rest is liquefied.
- The resistance against which a train is moved along a railway is overcome by means of energy obtained from the combustion of fuel, or in some few cases by energy obtained from a waterfall.
Produced by the combustion of 1 lb of coal, 15,000 Xo 06 =900 only are available for tractive purposes.
The maximum rate of combustion may be as much as so lb of coal per square foot of grate per hour, and in exceptional cases even a greater rate than this has been maintained.
It is not economical to force the boiler to work at too high a rate, because it has been practically demonstrated that the boiler efficiency decreases after a certain point, as the rate of combustion increases.
A few experimental results are set forth in Table XX., from which it will be seen that with a relatively low rate of combustion, a rate which denotes very light service, namely lb of coal per square foot of grate per hour, the efficiency of the boiler is %, which is as good a result as can be obtained with the best class of stationary boiler or marine boiler even when using economizers.
The draught corresponding to the smallest rate of combustion shown in Table XX.
The observed heat of combustion of sugar is, however, 1354000, so that the error of the rule is here 20 per cent.
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.
Different from the observed heat of combustion of sugar.
Of the analogy between combustion and respiration - both true phlogistic processes in his view - he had convinced himself three years before, and his paper, "On Different Kinds of Air" (Phil.
Was primarily based upon certain experiments on combustion and calcination, and in effect reduced the number of the alchemical principles, while setting up a new one, a principle of combustibility, named phlogiston (from (PXoyun-6s, burnt).
The violence or completeness of combustion was proportional to the amount of phlogiston present.
Combustion meant the liberation of phlogiston..
Mayow had suggested the existence of two components, a spiritus nitroaerus which supported combustion, and a spiritus nitri acidi which extinguished fire; J.
Thorpe's investigation of the products of the slow combustion of phosphorus.
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.
The heat of combustion, as first determined by Julius Thomsen, agreed rather better with the presence of nine single unions.
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.
The procedure for a combustion is as follows: - FIG.
Difficultly volatile liquids may be weighed directly into the boat; volatile liquids are weighed in thin hermetically sealed bulbs, the necks of which are broken just before they are placed in the combustion tube.
The length of time and other disadvantages attending the combustion method have caused investigators to devise other processes.
In the first method the substance, mixed with quicklime free from chlorine, is heated in a tube closed at one end in a combustion furnace.
According to Liebig, man's body is a stove, and food the fuel which keeps up the internal combustion in the lungs.
The animal heat is the result of a slow combustion, and disease and death take place when this is too rapid; or for want of fuel, or from some defect in the draught, the fire goes out.