305, 306] 



Experimental Values 



251 



COMPARISON WITH EXPERIMENT. 

 Determination of Size o/ Molecules. 



306. Since the value of K can be determined experimentally, it is clear 

 that, upon the supposition that the molecules may be regarded as elastic 

 spheres, equation (581) will give valuable information as to the magnitude 

 of <r. The agreement or disagreement of the value of a- obtained in this 

 way with that obtained in other ways, can be regarded as evidence as to the 

 tenability or the reverse, of the hypotheses on which we have been working. 



In the following table are given the coefficients of viscosity of various 

 gases, and the calculated values of <r, the radius, obtained by taking 

 v = 4 x 10 1D in accordance with 8. 



The meaning of the figures in the third column is as follows : 

 * These values are taken from Landolt and Bornstein's tables. 



