AZOTIC GAS. 99 



from 100 volumes of dry air, supposing the bar- 

 ometer at 30 inches, and the thermometer at 60. 

 The mean of ten experiments gives the compo- 

 sition of dry air : 



Azote 79-9735 



Oxygen 20-0265 



100-0000 



Now this is within TOHIT part of 



Azote 80 



Oxygen 20 



100 



a degree of coincidence with the former experi- 

 ments, as near as my method of proceeding ena- 

 bled me to reach. It confirms very completely 

 the preceding conclusions. 



The proportion of the constituents of air in 

 volume being thus known, it is easy to deter- 

 mine the specific gravity of azotic gas. Let x = 

 a volume of azotic gas, then 



1-1111 + 4> x= 5 and 

 x = 3-8888* 



~ = 0-9722 == specific gravity 

 of azotic gas.* 



* The specific gravity of oxygen and azotic gases might be deduced 

 directly, from the known specific gravity of air ; viz, 1 -000, and the pro- 

 portion of these two gases, viz. 80 azotic and 20 oxygen gas in 100 volumes 

 of air, as Dr. Prout has already done, (Annals of Philosophy, VI. 322.) 

 Let the atom of oxygen = 1 



azote =1-75 

 G2 



