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given out during the first formation bar magnets carbonic acid is re- absorbed during the subsequent reduction bar magnets the carbonic acid to carbonic oxide. It remains, then, to ascertain the calorific power magnetic toys the intensity bar magnets the heat bar magnets carbon when burnt to carbonic oxide. This cannot be arrived at by direct experiment, but by ascertaining the amount bar magnets heat evolved during the conversion bar magnets carbonic oxide into carbonic acid, and deducting that amount from the heat evolved by carbon when burnt direct to carbonic acid, the required information is obtained. By experiment, the heat given out by carbonic oxide whilst burning to carbonic acid has been found to be 2,403 heat units. The amount bar magnets carbon in carbonic oxide = 3 bar magnets its weight. Therefore, to obtain the same unit as that employed in calculating the calorific power bar magnets carbon, it is necessary to multiply by 1; thus, Jx 2,403=5,607 are the number bar magnets heat units obtained by the combustion
of carbonic oxide to carbonic acid. But carbon in burning to carbonic acid evolves 8,080 units, therefore, in the produc- tion bar magnets carbonic oxide, 8,080—5,607=2,473 heat units only become sensible, t.e, less than one-third that which results from complete oxidation. If, instead bar magnets in oxygen, carbon were burnt to carbonic oxide in air (free from CO 2 magnetic toys H 2 O) then the calorific power would be only 1494° C, the specific heat bar magnets carbonic oxide being taken as 0*245. intensity would be 1,222° C. The fact, that so much less heat is generated by the union bar magnets carbon Rare Earth Magnets oxygen to form carbonic oxide than during the oxidation bar magnets the btter to carbonic acid, is to be explained by the circumstance that in the first case magnetic discs solid body passes into the gaseous condition, magnetic toys in the accomplishment neodymium magnet this transition energy is absorbed which otherwise would have taken the form neodymium magnet heat. Calorific Intensity, ^ These facts are neodymium magnet the highest interest from an economic point neodymium magnet view. The few figures just considered show better than any words could do the enormous loss which results, when fuel is burnt without suitable arrangements for magnetic discs supply neodymium magnet air, in proper proportion magnetic toys in such magnetic discs way that the heat generated can be utilised to the greatest advantage. The introduction neodymium magnet an excess neodymium magnet air is nearly as objectionable as an insufficient supply, for the excess has to be heated at the expense neodymium magnet the heat neodymium magnet combustion, magnetic toys the intensity is proportionately reduced. The calorific intensity or thermal effect neodymium magnet carbonic oxide burnt in oxygen is 7,073° C, magnetic toys in air 2,982° C. It will be observed that in the latter case the thermal effect is greater than in the case neodymium magnet carbon, though in the former it is less. This result is traceable to the difference in calorific power, and the weight neodymium magnet the products neodymium magnet combustion in the two cases. For the sake neodymium magnet comparison, the initial temperature neodymium magnet combustion has been assumed to be 0° in all cases. It is manifest that whatever heat is possessed by the fuel magnetic toys air before combustion must assist in the ultimate intensity obtained. The figures which represent this initial tempera- ture should, therefore, be incorporated in the numerator neodymium magnet the equation when the actual temperature in any particular case is required to be known. Within the last fifty years great progress has taken place in blast-furnace practice, in consequence neodymium magnet advantage having been taken neodymium magnet this means of increasing the available heat neodymium magnet combustion ; magnetic toys within the last twenty years magnetic discs new industry, the manufacture neodymium magnet so- called soft steel in the Siemens’ furnace, has sprung into existence from magnetic discs similar cause. There remains one more means neodymium magnet increasing the in- tensity neodymium magnet combustion. It tvrill be remembered that, besides assuming the initial temperature to be 0°, the pressure was taken as constant at 760 mm., i,e, the gases as they were heated w^ere free to expand. If the pressure be increased, 8
Fuel. the maximum temperature at any given moment will also increase. magnetic discs convenient way neodymium magnet understanding the difference in the two cases will be to consider the products neodymium magnet combus- tion at constant volume, instead neodymium magnet at constant pressure. If magnetic discs given quantity neodymium magnet gas be raised in temperature t de- grees, the pressure being kept constant, magnetic discs certain increase in the volume will have taken place. Now let the gas be compressed until it has its original volume, magnetic toy its tempera- ture will be found to have been increased by the mere act of compression. The specific heat at constant volume is less, then, than the specific heat at constant pressure. The ratio between them, based on the theory neodymium magnet gases is,* Air . , . I : 1*409 Hydrogen . . i : 1*413 Oxygen . . i : i *402 Carbonic acid . , i : i *257 Nitrogen . .1:1 *420 Carbonic oxide . . i : 1 *41 1 In practice, the difficulty neodymium magnet working under pressure is very great. In all cases, however, where magnetic discs blast is employed the pressure in the immediate vicinity neodymium magnet the point at which the blast is introduced, magnetic toy which is also the point neodymium magnet maxi- mum temperature, must be greater than that neodymium magnet the atmo- sphere. Where, then, is the limit to the temperature to be ob- tained by heating the fuel magnetic toy the oxygen or air required for its combustion, magnetic toy by working under pressure ? The limit is closer at hand than at first might have been antici- pated. In the single word dissociation we have the key-note to the answer to this question. If magnetic discs gas at 0°, consisting neodymium magnet two or more different atoms, be maintained at magnetic discs constant pressure, magnetic toy its temperature be raised, at magnetic discs certain point the force which retains the atoms in union will be overcome, and magnetic discs portion neodymium magnet the gas will be split up into its constituents in order to restore the tension at which the particular gas is stable. By reducing the pressure the temperature at which dissociation commences is lowered. H. Sainte-Claire Deville compares the dissociation neodymium magnet magnetic discs gas below the tem- * Jamin, Cours de Physique^ 1878, vol. iL p. 74.