642 



TABLE 696.— VISCOSITY, v , MEAN FREE PATHS, L, MOLECULAR DIAMETERS, 



5, AND RELATED DATA FOR A NUMBER OF GASES* 



Gas: 



Characteristic H 2 He Ne Air 2 A C0 2 Kr Xe 



x*+ .69 .64 .67 .79 .81 .86 .95 .85 .92 



10 7 Xi»»°t 871 1943 3095 1796 2003 2196 1448 2431 2236 



10'XV 839 1878 2986 1722 1918 2097 1377 2372 2129 



10 7 Xi»»° 892 1986 3166 1845 2059 2261 1496 2502 2308 



lO'Xlo' 1 * 8.39 13.32 9.44 4.54 4.81 4.71 2.95 3.69 2.64 



10 n XL ° 7eo 11-04 17.53 12.42 5.98 6.33 6.20 3.88 4.85 3.47 



\0 3 XU° x 9.31 14.72 10.45 5.09 5.40 5.31 3.34 4.06 2.98 



10 6 XL»° 70 ° 12.26 19.36 13.75 6.69 7.10 6.67 4.40 5.34 3.93 



10 8 X« 2.75 2.18 2.60 3.74 3.64 3.67 4.65 4.15 4.91 



C 84.4 80 56 112 125 142 254 188 252 



10- U XAT. § 15.22 24.16 17.12 8.24 8.71 8.54 5.34 6.69 4.78 



10-°X«*I 14.45 7.16 1.68 6.98 6.26 5.70 8.61 6.48 5.71 



* For reference, see footnote 219, p. 636. 



** x from relations t) T = aT z . t C = a measure of strength of the attraction forces (in dynes) between 



molecules. t Loo 1 = mean free path at 0°C and 1 mmHg, etc. § JV« = number of molecules/cm 2 for 



monomolecular layer. % to = collision frequency (sec -1 ) at 25°C and 760 mmHg. 



SMITHSONIAN PHYSICAL TABLES 



