50 TABLE 29. 



DIFFUSION. 



2 /- C& da. 

 Inverse* values of v fc = i ^f~J 



log x = log (2?) + log\//A t expressed in seconds. 

 = log 8 + \og\/ki. t expressed in days. 

 = log 7 -f- log \/kt. " " years. 



j, k = coefficient of diffusion.! 

 * = initial concentration. 

 v = concentration at distance x, time t. 



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

 of Sci. vol. III. 1897, p. 280. t For direct values see table 23. 



Taken from unpublished manuscript of C. E. Van Orstrand. 

 SMITHSONIAN TABLES, 



