60 Table 31 



DIFFUSION INTEGRAL 



Inverse * values of v lc= r — —7- / e~^do 



log x = log (zq) + \og\/&i. t expressed in seconds. 



= log 5 + logv 7 ^- t expressed in days. 



= log 7 + log sjkt. " " years. 



k — coefficient of diffusion, t 

 c = initial concentration. 

 v = concentration at distance x, time t. 



* Kelvin, Mathematical and Physical Papers, vol. 1 1 1, p. 428 ; Becker, Am. Jour. 

 of Sci. vol. III. 1897, p. 280. «For direct values see table 2A. 



Smithsonian Tables. 



