Table 210. 



CRITICAL TEMPERATURES, 



PRESSURES, 

 OF CASES.* 



VOLUMES, AND DENSITIES 



6 =: Critical temperature. 

 P:= Pressure in atmospheres. 



= Volume referred to air at o° and 76 centimetres pressure. 

 (f^ Density in grammes per cubic centimetre. 



I 



* Abridged for the most part from Landolt and Boernstein's " Phys. Chem. Tab." 



Note. — Guldberg shows (Zeit. fiir Phys. Chem. vol. s, p. 375) that for a large number of organic substances the 

 ratio of the absolute boiling to the absolute critical temperature, although not constant, lies between 0.58 and 0.7, the 

 majority being between .65 and .7. Methane, ethane, and ammonia gave approximately 0.58. HjS gave .566, and 

 CSj, N»0, and O gave about .59. 

 Smithsonian Tables. 



200 



