| Weight of 100 cubic inches. | Sp. Gravities. | |||
| Vap. air | 30.5 | grains | 1 | 14.4 |
| Vap. hydrogen | 2.118 | — | .0694 | 1 |
| Dry air | 30.746 | grains | 1 | 17.7 |
| Dry hydrogen | 1.736 | — | .05645 | 1 |
FORMULÆ FOR DETERMINING THE
PROPORTIONS OF COMBUSTIBLE GASES
IN MIXTURES.
It frequently happens, especially in the decomposition of vegetable substances by heat, that the product consists of several combustible gases in mixture, and it is desirable to determine the proportions of each of those which collectively constitute the mixture. The following forms will be found useful for this purpose.
1. Carbonic oxide and hydrogen.
Let x = the volume of carbonic oxide, y = that of hydrogen, w = that of mixture, and a = that of carbonic acid, produced by exploding the mixed gases with oxygen over mercury.
Then the carbonic oxide, or x = a,
and the hydrogen, or y = w - a.
2. Sulphuretted hydrogen and hydrogen.
Let x = the volume of sulphuretted hydrogen, y = that of hydrogen, w = that of the mixture, and g = the oxygen spent in the combustion of w.
- Then because x + y = w,
- and 1½x + ½y = g;
- we have x = g - ½w,
- and y = 1½w - g.