136 TABLES 121-122. 



TABLE 121 .-VISCOSITY OF GASES AND VAPORS. 



The values of p given in the table are io 6 times the coefficients of viscosity in C. G. S. units. 



* The values here given were calculated from Koch's table (Wied. Ann. vol. 19, p. 869) by the formula y. = 489 [i -f- 

 746 (* 270)]. 



TABLE 122.- VISCOSITY OF AIR. 2O.2C. 



Markowski, ditto. 1904 

 Tanzler, Ver. D. Phys. G. 1906 

 Tomlinson, Phil. Trans. 1886 



Hogg, Am. Acad. Proc. 1905 

 Gilchrist 



1.835 

 1.836 

 1.811 

 1.812 

 1.812 



1. 808 



1.812 



Holman, Phil. Mag. 1886 1.810 X io * Markowski, ditto. 1904 1.835X10' 



Fischer, Phys. Rev. 1909 1.807 

 Grindlay, Gibson, Pr. Roy. Soc. 



1908 1.809 



Rankine, ditto. 1910 1.814 



Rapp, unpublished 1.810 



Breitenbach, Wied. Ann. 1899 1.833 



Schultze, Ann. der Phys. 1901 1.837 



The viscosity of air at 20.2 may be taken as 1.812 X io * within a probable error of less than 

 0.2 per cent. Its variation with the temperature may be obtained from Holman's formula 

 = 1715.50 X io 7 (i +0.00275* 0.00000034/ 2 ). See Phys. Rev. 1913, p. 124, where full refer- 

 ences may be obtained. 



SMITHSONIAN TABLES. 



