296 



Tables 286-288 



TABLE 286. — Latent and Total Heat of Vaporization, Formulae 



total heat from fluid at o° to vapor at t° C. T° refers to Kelvin 



t = latent heat of vaporization at t" C; H 

 scale. Same units as preceding table. 



TABLE 287. — Latent Heat of Vaporization of Ammonia 



CALORIES PER GRAM 



Osborne and van Dusen, Bui. Bureau Standards, 14, p. 439.. 1918. 



TABLE 288. — "Latent Heat of Pressure Variation" of Liquid Ammonia 



When a fluid undergoes a change of pressure, there occurs a transformation of energy into heat or vice versa, which 

 results in a change of temperature of the substance unless a like amount of heat is abstracted or added. This change 

 expressed as the heat so transformed per unit change of pressure is the "latent heat of pressure variation." It is ex- 

 pressed below as Joules per gram per kg/cm 2 . Osborne and van Dusen, loc. cit., p. 433, 1918. 



Smithsonian Tables. 



