TABLE 111. 

 DENSITY OF GASES 



127 



The following table gives the density as the weight in grams of a liter (normal liter) of the gas 

 at o C, 76 cm pressure and standard gravity (sea-level, 45 latitude), the specific gravity referred 

 to dry, carbon-dioxide-free air and to pure oxygen, and the weight in pounds per cubic foot. Dry, 

 carbon-dioxide-free air is of remarkably uniform density; Guye, Kovacs and Wourtzel found maxi- 

 mum variations in the density of only 7 to 8 parts in 10,000. For highest accuracy pure oxygen 

 should be used as the standard gas for specific gravities. Observed densities are closely propor- 

 tional to the molecular weights. 



SMITHSONIAN TABLES. 



