Viscosity and Atomic Weight for the Inert Gases. 47 



result that the viscosity-atomic weight curve becomes smooth, 

 and the square o£ the viscosity at the critical point is found 

 to be proportional to the atomic weight. This relation has 

 been deduced from the values for argon, krypton, and xenon 

 only, because the critical temperature of neon has not 

 been determined, and that o£ helium is not known with 

 certainty. 



The carve in fig. 2 is the parabola whose equation is 



A 



= 3-93x10- 



Fiar. 2. 



A 



. 3-93 xl0"'° 







>^X 



*-^*^C.tn 









/He 







100 



200 



ATOMIC WEIGHT. 



where rj c is the viscosity at the critical temperature and A 

 is the atomic weight. The calculated value of r\ G for helium 

 (assuming the probable value 5° absolute for the critical 

 temperature) is also shown on the curve. It will be seen 

 that it is considerably removed from the theoretic curve, and 

 it should be pointed out that the uncertainty as to the 

 critical temperature is wholly insufficient to account for the 

 departure. 



