14
as during, and after its absorption, 17 grains of air,equal to 53 '2 cubic inches entered, it evidently filledsuch a space. 53'2 cubic inches of it consequentlyweigh 40 grains, and 100 cubic inches 75'17 grains.Then "75 cubic inches weigh '56 grains, and this addedto 40, makes 40 - 56 grains, equal to 53'95 cubic inches,the whole quantity of aeriform nitrous acid produced.
But the quantity of nitrous gas entering into this,allowing for the nitrogen it contained, is 27’6 grains,equal to about 80 - 5 cubic inches; and the oxygen is40 - 56—27'6 = to 12'96 grains, or 36'9 cubic inches.
V. There could exist in this experiment no circum-stance connected with inaccuracy, except the impossibi-lity of very minutely determining the quantities ofcommon air which entered with the gases from the stop-cocks. But if errors have arisen from this source, theymust be very inconsiderable; as will appear from a cal-culation of the specific gravity of the nitrous acid gas,founded on the volume of the gases that entered theglobe.
The air that remained in the globe after
exhaustion was 15 grains = 47* cub. in.
The nitrous gas introduced was - 82
Common air - - - - - 13
Oxygen - - - - - 70
Common air - - - - - 1
Whole quantity of air thrown into theglobe ----- 213
From which subtract its capacity - 148
The remainder is 65
* Decimals are omitted, because the excess of the two first numbersis exactly corrected by the deficiency of the last.