6o 



TABLE 31 . 

 DIFFUSION. 



Inverse * values of < /c = i -77 



log x = log (2y) + logx/Xtf. t expressed in seconds. 



= log 6 + logx/^A / expressed in days. 



= log 7 + log \/kf. " years. 



k = coefficient of diffusion.! 

 c = initial concentration. 

 v = concentration at distance x, time t. 



t Kelvin, Mathematical and Physical Papers, vol. III. p. 428 ; Becker, Am. Jour, 

 of Sci. vol. III. 1897, p. 280*. *For direct values see table 24. 



SMITHSONIAN TABLES. 



