208 



TABLE 229. 

 DIFFUSIVITIES. 



The diffusivity of a substance = h 2 = k/cp, where k is the conductivity for heat, c the spe- 

 cific heat and p the density. (Kelvin.) The values are mostly for room temperatures, about i8C. 



Taken from "An Introduction to the Mathematical Theory of Heat Conduction," Ingersoll and Zobel, 1913. 

 SMITHSONIAN TABLES. 



