138 



Tables 1 1 9-1 1 9a. 

 DIFFUSION OF GASES, VAPORS, AND METALS. 



TABLE 119. — Coefllclents ol Diffusion for Various Qases and Vapors.* 



Gas or Vapor difiusing. 



Air .... 



Carbon dioxide 



Carbon disulphide 

 Carbon monoxide 



Ether 



Hydrogen 



Nitrogen 

 Oxygen . 



Sulphur dioxid 

 Water . , 



Gas or Vapor diffused 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 . . . 



Temp. 



°C. 



i8 



Coefficient 

 of Diffusion. 



0.661 



0.1775 

 0.1423 

 0.1360 

 0.1405 

 0-1314 

 0.5437 

 0.1465 

 0.0983 



C.I 802 



0.0995 

 O.I314 

 O.IOI 



0.6422 

 o. 1 802 



0.1872 



0.0827 



0.3054 



0.6340 



o.53''^4 

 0.6488 



0-4593 

 0.4863 

 0.6254 



0-5347 

 0.6788 

 0.1787 



0.1357 

 0.7217 

 0.1710 

 0.4828 

 0.2390 

 0.2475 

 0.8710 



Authority. 



Schulze. 



Obermayer. 



Loschmidt. 



Waltz. 



Loschmidt. 



Obermayer. 



Loschmidt. 



Stefan. 

 Obermayer. 



Loschmidt. 



Obermayer. 

 Stefan. 



Obermayer. 



Loschmidt. 

 Obermayer. 

 Loschmidt. 

 Guglilemo. 



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



TABLE 119 A. — Diffusion of Metals Into Metals. 



dv i,4-2L. where x is the distance in direction of diffusion; v, the degree of concentration of 



fjH dx^ ' t^^ diffusing metal ; /, the time ; k, the diffusion constant = the quantity of metal 



in grammes 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, Philosophical Transactions, 1896 A. 

 * These values are from Guthrie. 



Smithsonian Tables. 



