I 



ON HYDROGEN. 513 



9. From these experiments it is easy to deduce 

 the composition of this inflammable gas. Its spe- 

 cific gravity being 0.555, 100 cubic inches of it, at 

 the temperature of 6o Q , and when the barometer 

 stands at 30 inches, will weigh 16.93 grains. 



Of the 205 cubic inches of oxygen gas consu- 

 med^ 104 go to the formation of carbonic acid 

 gas; the remaining 101 cubic inches must have 

 combined with hydrogen during the combustion, 

 and formed water. Hydrogen, in the gaseous 

 state, combines with exactly half its bulk of oxy- 

 gen gas ; therefore the hydrogen, which went to 

 form water in the present case, must have been 

 equivalent to 202 cubic inches. 



If we suppose with Saussure, (and it is the sup- 

 position least favourable to our present purpose % 

 that carbonic acid gas contains 27.5 per cent, of 

 carbon, in that case the carbon contained in 104 

 cubic inches of it must weigh 13.24 grains. The 

 weight of 202 cubic inches of hydrogen gas is 

 5.17 grains. Thus we have ascertained, that 100 

 cubic inches of the inflammable gas from stag- 

 nant water, contains, of carbon, 13.24 



hydrogen, 5.17 



Total, 1S.41 

 But the weight of 100 cubic inches 



of the gas is only - 16.93 



So that the constituents found by — — ■ 

 analysis, exceed the weight of 

 the gas - - 1.48, or almost 



m grain. 



K. Iv 



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