136 Tables 121-122. 



Table 121 .-VISCOSITY OF GASES AND VAPORS. 



The values of it given in the table are 10* 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 (x = 489 [i + 

 746 (i— 270)]. 



Table 122. -VISCOSITY OF AIR. 20.2°C. 



Holman, Phil. Mag. 1886 

 Fischer, Phys. Rev. 1909 

 Grindlay, Gibson, Pr. Roy. Soc. 



1908 

 Rankine, ditto. 1910 

 Rapp, unpublished 

 Breitenbach, Wied. Ann. 1899 

 Schultze, Ann. der Phys. 1901 



The viscosity of air at 20.2° may be taken as 1.812 X 10—* 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 10—' (i +0.00275/ — 0.00000034/'). See Phys. Rev. 1913, p. 124, where full refer- 

 ences may be obtained. 



Smithsonian Tables. 



