some Constants of the Inert Gases. 73 



straight that for present purposes the relation may be con- 

 sidered linear. The numbers used for the mean free paths 

 are given below. 



Table III. 



Element. 



Square roots of mean free paths (Rankine). 



At 0° 0. 



At 100° 0. 



Helium 



1 



•839 

 •595 

 •523 

 •445 



1-11 



•927 

 •674 

 •598 

 •515 



Neon .. 



Argon 





Xenon 





On the kinetic theory in its simplest form the root of the 

 mean free path is inversely proportional to the radius of 

 the sphere of action. To a first approximation, then, we find 

 in these five gases a linear relation between the number of 

 electrons influencing dispersion and the reciprocal of the 

 radius of the sphere of action as determined from measure- 

 ments of the viscosity. 



Another interesting result is obtained by plotting N 2 

 against a, the reciprocals of the numbers given in Table III. 

 These numbers are shown in Table IV, 



Table IV. — Relative radii of the spheres of action of the 

 inert Pases at 0° and 100° C. 





At 0° O. 



At 100° C. 



Helium 



10 



1-19 



T6S 



roi 



2-26 



•902 

 1-082 

 1-482 

 1*68 

 1-94 



Neon 



Argon 



Krypton 



Xenon 





