644 



TABLE 698*.— DIFFUSION COEFFICIENTS OF GASEOUS IONS AT NTP 221 



Gas D* 



Air 028 



Oxygen 025 



Carbon dioxide 023 



Nitrogen 029 



Hydrogen 123 



Dry gas 



* Tables 698-700 and 702 prepared by J. D. Cobine, General Electric Co., Schenectady, N. Y. 

 m Cobine, J. D., Gaseous conductors, 2d ed., McGraw-Hill Book Co. Used by permission of the 

 publishers. 



TABLE 699.— DIFFUSION COEFFICIENTS OF NEUTRAL GASES AT 0°C 



AND 760 mmHg* 



* For reference, see footnote 221, above. 



** D in cmVsec. t D = Do(T /To) m (po/p ), where Do is the value of D in the table, To 



po = 1 atm. 



0°C, 



TABLE 700.— MOBILITIES OF POSITIVE IONS IN NOBLE GASES AT 

 760 mmHg AND 0°C * 



(cm/sec per volt/cm) 



Ion He 



Gast 20.1 



Li 24.2 



Na 22.7 



K 21.5 



Rb 20.1 



Cs 18.4 



* For reference, see footnote 221, above, 

 t Ions same as gas. 



TABLE 701.— MOLECULAR DIAMETERS, 5, FOR ATTRACTIVE SPHERES* 



* For reference, see footnote 220, p. 640. 

 t Viscosity. t Van der Waal's equation. 



SMITHSONIAN PHYSICAL TABLES 



