Lessons in elementary physics / by Balfour Stewart.

  • Balfour Stewart
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Lessons in elementary physics / by Balfour Stewart. Source: Wellcome Collection.

    482/502 page 462
    CHAP. X . Table 47.—Heat Developed diking Combustion in Oxygen. Kilogrammes of water raised i® C. by the Substance burned. combustion of one Compound formed, kilogramme of each substance. Hydrogen 34Ij5 • H„0 Carbon . . 7990 CO^ Sulphur 2263 SO._. Phosphorus ... 5747 P..O5 Zinc 1301 ZnO Iron 1576 FejO, Carbonic Oxide . . 2417 CO, Marsh Gas . . 1.3085 CO,andH„G Olefiant Gas .... 11900 do. do -\lcohol 7016 . do. do.. 452. Law of Andrews.—Andrews has likewise studied the heat given out during the mutual action of metals, and has been led to the following result :— If there be three metals. A, B, C, szich that A will displace B ana I C from their combinations, while B will displace C, then the hcac I developed by substituting A for C will be equal to that produced by substituting A for B, plus that produced by substituting B for C. f This law is similar to that obtained for electro-motive forcei ! (Art. 385), and this leads us to believe that the electro-motive^ 1 forces are really those which cause heat when chemical com- bination takes place. This conjecture is confirmed by thei 1 fact, that if the metals be classed .according to the amount of i heat which they give out when displacing one another, we. ’ reproduce the electro-motive series of Art. 386. 453. Dissipation of Energy.—We have seen (.Art. no) thafi 1 the law of the conservation of energy is nothing more than an' intelligent and well-supported denial of the chimera of per-r i petual motion, .and that .a m.achine can no more create work' < than it can crc.ate matter. Nevertheless a champion of per- ( petual motion might assent to all this without absolutely giving. 1 up his cause. < “ I acknowledge,” he might s.ay, “that perpetual motion, in 1 one sense of the word, is quite impossible, for no m.achine can : create energy, but yet I do not see that a m.achine might not be t
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