Molecules of a Gas in a Field of Force. 



645 



an approximation which regards the specific heat of elec- 

 tricity as negligible. To the degree o£ precision at present 

 attainable in measurements o£ this kind there caDnot, I 

 think, be considered to be any serious difference between 

 (35) and the formula A 3 Th~^ 3 ^ T , which is more generally 

 employed. Both this expression and (35) are generally 

 capable of expressing the measurements quite satisfactorily 

 over the ranges of temperature which have been tested. 



Fig. 1. 



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The important difference between the thermodynamic theory 

 and the present one is that, except for the small correction 

 factor arising from g(C,Xi) 9 A 2 has the same value for all 

 good conductors, and that this common value is determined 



