76 Mr. Olive Cuthbertson on New Determinations of 



Since it has been shown above that a linear relation also 

 exists between the squares of the number o£ electrons and 

 the radius of the sphere of action, it follows that a similar 

 relation exists between the radius and the critical temper- 

 ature. This is shown in fig. 4. The agreement is even 

 better than in figs. 2 and 3. 



Fig. 4. — Inert Gases. 



Critical temperatures plotted against radii of spheres of action at 



0° and 100° C. 



flSSOLUTS 

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300 r 



500 



100 



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2-0 



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Relation between the Number oe Electrons and 

 the Constant C in Sutherland's Formula. 

 In his second paper Eankine shows that the temperature 

 coefficient of the viscosity may be of great importance. 

 Using Sutherland's formula 



where T is the absolute temperature and K and C constants 

 for the gas, he obtains the following values for C from two 

 observations of the viscosity : — 



C. 



Helium 70 



Neon 56 



Argon 142 



Krypton 188 



Xenon 2o2 



