116 AZOTIC GAS. 



and some water is deposited upon the inside of 

 the eudiometer. If the experiment be made 

 when the barometer stands at 30 inches, and 

 the thermometer at 60, the residual gas will 

 amount to 101 '77 volumes. But this gas is sa- 

 turated with humidity if it were quite dry, its 

 volume would be 100.* 

 its consti. Thus it appears, that when protoxide of azote 



tution and 



atomic is mixed with its own volume of hydrogen gas, 

 and fired, the gaseous residue, which is azotic 

 gas, is just equal to the original volume of the 

 gas the hydrogen gas has disappeared and been 

 converted into water it must, therefore, have 

 combined with a quantity of oxygen, which, had 

 it been in the state of gas, would have amounted 

 to half the bulk of the hydrogen gas. The con- 

 stituents of protoxide of azote then are 



1 volume of azotic gas 1 



_ V condensed into one volume. 



volume or oxygen gas ) 



But a volume of azotic, and i a volume of oxy- 

 gen gases, are each equivalent to an atom ; 

 hence this gas is a compound of 1 atom azote + 

 1 atom oxygen, so that its atomic weight is 2*75. 



* Let the volume of dry gas be x, and let;> = 30 ; and /= 0*524. 

 We have 



=101.77 



The solution of this equation will give .r = 100. 



9 



