. The principles of chemistry . appears invariably to contain a smallquantity of water, as Boussingault has observed. These observations lead to theassumption that air always contains a certain quantity of gaseous hydrocarbons, likemarsh gas, which, as we shall afterwards learn, is evolved from the earth, marshes, amount, however, does not exceed a few hundredths \)er cent. 236 PEINCIPLES OF CHEMISTRY 20-88 2^ parts by volume of oxygen ; the mean amount of oxygen willtherefore be 20*92 ± 005 per cent. Taking the density of air = 1 andof oxygen = 1-105 and nitrogen 0-972 the composition
. The principles of chemistry . appears invariably to contain a smallquantity of water, as Boussingault has observed. These observations lead to theassumption that air always contains a certain quantity of gaseous hydrocarbons, likemarsh gas, which, as we shall afterwards learn, is evolved from the earth, marshes, amount, however, does not exceed a few hundredths \)er cent. 236 PEINCIPLES OF CHEMISTRY 20-88 2^ parts by volume of oxygen ; the mean amount of oxygen willtherefore be 20*92 ± 005 per cent. Taking the density of air = 1 andof oxygen = 1-105 and nitrogen 0-972 the composition of air by weightwill be 23-12 per cent, of oxygen and 76*88 per cent, of nitrogen.^^ The possibility of the composition of air being altered by the mereaction of a solvent very clearly shows that the component parts of airare in a state of mixture, in which any gases may occur ; they do notin this case form a definite compound, although the composition of theatmosphere does appear constant under ordinary conditions. The fact.
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