Tables 1 85 and 1 86 



DIFFUSION OF GASES, VAPORS AND METALS 



TABLE 185. — Coefficients of Diffusion for Various Gases and Vapors 



217 



Gas or Vapor diffusing. 



Gas or Vapor diffused into. 



Air .... 

 u 



Carbon dioxide 



Carbon disulphide 

 Carbon monoxide 



Ether . . 

 Hydrogen 



Nitrogen 

 Oxygen . 



Sulphur dioxide 

 Water . . 



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. Coefficient 

 C. of Diffusion. 



O.661 



0.1775 



O.I423 



o. 1 360 



O.I4O5 

 0.1314 



0-5437 

 O.I465 

 O.O9S3 

 O.I802 

 O.O995 

 O.I3I4 

 O.IOI 



0.6422 

 0.1802 

 0.1872 

 0.0827 



0.3054 



0.6340 



o-53 8 4 

 o 6488 



04593 

 0.4863 

 0.6254 



0-5347 

 0.6788 

 0.1787 



0-I357 

 0.7217 

 o. 1 7 1 o 

 0.4828 

 0.2390 



0-2475 

 0.8710 



Authority 



Schulze. 



Obermayer. 



Loschmidt. 



Waitz. 



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 186.— Diffusion of Metals Into Metals 



dv J-v where x is the distance in direction of diffusion; v, the degree of concentration of 



jt == ,{ x i ' the diffusing metal ; /, 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, Philosophical Transactions, 187A, p. 383, 1896. 

 * These values are from Guthrie. 



Smithsonian Tables. 



