Table 92 343 



PROPERTIES OF CONDENSED WATER, LATENT AND SPECIFIC HEATS 



(Further explanation on p. 331.) 



In Table 92 are listed values of the isobaric specific heats d and c w of solid (ice) and 

 liquid water, respectively. In order to obtain those of c w below °C. it was necessary to 

 extrapolate the Goff-Gratch formula for e w (T) and the Smith-Keyes liquid volume data. 8 

 Only the former extrapolation contributes appreciable uncertainty to the results, but the. 

 justification for relying upon it pending further research has been discussed elsewhere. 9 



In Table 92 are also listed values of the pressure derivative of c w , namely, (3c«,/3/>)r 

 above °C. No attempt has been made to calculate values for temperatures below °C. 

 because of the uncertainty of present knowledge regarding c w itself at these temperatures. 



In Table 92 are also listed values of the latent heats of vaporization, fusion, and sub- 

 limation as calculated from the Goff-Gratch formulation. Values for undercooled liquid 

 are consistent with and, therefore, subject to the same extrapolation uncertainties as are 

 the values of c*. 



PROPERTIES OF CONDENSED WATER, LATENT AND SPECIFIC HEATS 



a =specific heat of ice, ITcal. g." 1 °K."\ 

 Cv, =specific heat of water, ITcal. g." 1 "K." 1 , 

 (3c M /3/>)r =pressure derivative of c w at constant temperature, 10" 

 L v =latent heat of vaporization of water, ITcal. g."\ 

 L f =latent heat of fusion of water, ITcal. g. -1 , 

 L, =latent heat of sublimation of water, ITcal. g." 1 



ITcal. g." 1 °K.- J mb. 



8 Smith, L. B., and Keyes, F. G., Proc. Amer. Acad. Arts and Sci., vol. 69, pp. 285-314, 1934. 



Goff, J. A., Final report of the Working Subcommittee of the International Joint Committee on 

 Psychrometric Data. A paper presented before the American Society of Mechanical Engineers in 

 December 1948, Amer. Soc. Mech. Eng. Trans., vol. 71, 1949. 



SMITHSONIAN METEOROLOGICAL TABLES 



