404 Table 120 



THERMAL CONDUCTIVITY AND THERMAL DIFFUSIVITY OF ICE 



Compiled by Dorsey 1 from the works of various investigators. 



Temperature Thermal conductivity Temperature Thermal conductivity 



"C. cal. cm.- 1 sec. -1 °C. -1 °C. cal. cm.- 1 sec. -1 °C. _1 



Thermal diffusivity, k/pc; (k = thermal conductivity, p = density, c = specific heat), 

 is 0.011 cm. 2 sec." 1 if t> — 30 °C. and is 0.0114 cm. 2 sec." 1 at t = 0. °C. Dorsey states 

 that the best values for the density of ordinary ice at one atmosphere and °C. vary 

 from 0.916 to 0.918 g. cm." 4 Values of the specific heat are given in Table 92. 



1 Dorsey, N. E., Properties of ordinary water substance, p. 482, Reinhold Publ. Corp., New York, 

 1940. 



Table 121 



THERMAL CONDUCTIVITY AND THERMAL DIFFUSIVITY OF SNOW 



Values of the thermal conductivity k of snow as computed from the formulas of three 

 investigators are given as a function of the density p of the snow in g. cm." 3 The last 

 column gives the average of the three. The formulas, for k in cal. cm." 2 sec." 1 °C. _1 cm., 

 are 



Jansson 1 k = . 00005 +.0019/) + .006p 4 



Van Dusen 2 k = .000050 + .00100p + .005*V 



Devaux 8 k = .000069 + .0069/> 2 



Density 



Conductivity — cal. cm.- 1 sec. -1 "C. -1 cm. 



1 Jansson, M., Ofvers. of K. Svenska Akad., Forh., vol. 58, p. 207. 1901. 



2 Van Dusen, M. S., Int. Crit. Tables, vol. 5, p. 216, 1929. 

 1 Devaux, J., Ann. de Phys., vol. 20, p. 5, 1933. 



SMITHSONIAN METEOROLOGICAL TABLES 



