1 58 Tables 163-164. 



DIFFUSION OF GASES, VAPORS, AND METALS. 



TABLE 163. — Coelflclenta of Difluslon for Varloas Gases and Vapors.* 



Gas or Vapor diffusing. 



Gas or Vapor difiused into. 



Hydrogen , . . 

 (Oxygen . . . . 

 Air 



Carbon monoxide 



Hydrogen . . . 



Methane . . , . 



Nitrous oxide .. . 



Oxygen . . . . 



Air 



Carbon dioxide 



Ethylene . . . . 



Hydrogen . . . 



Oxygen . . . . 



Air 



Hydrogen . . . 



Air 



Carbon dioxide 



" monoxide 

 Ethane , . . . 

 Ethylene . . . . 

 Methane . . . . 

 Nitrous oxide . . 

 Oxygen . . . . 



Carbon dioxide 

 Hydrogen . . . 

 Nitrogen . . . . 

 Hydrogen . . . 

 Air 



Hydrogen . . . 



* Compiled for the most part from a similar table in Landolt & Bornstein's Phys. Cham. Tab. 



TABLE 164.— Diffusion of Metals into Metals. 



dv d~v where x is the distance in direction of diffusion ; v, the degree of concentration of 



^ "^^ tf^ ' the diffusing metal; t, the time; k, the diffusion constant = the quantity of metal 

 in grams diffusing through a sq. cm. in a day when unit difference of concentra- 

 tion (gr. per cu. cm.) is maintained between two sides of a layer one cm. thick. 



From Roberts-Austen, Pliilosophical Transactions, 187A, p. 383, 1896. 

 * These values are from Guthrie. 



Smithsonian Tables. 



