( 122 ) 



C being the part which is independent of V. 



Since w, and ?i, are very large numbers, we easily see that the 

 expression (20) can be transformed to 



r a,«,' + 2 a ,,«, + «.V 



9 P 2 F 3 



-g-p^r^ "« ö +2"^ ' 36 f« 



2 2 2 

 where ft has been put for -no x l , ft for — *t <j 3 8 and j5 for — Jt o\ 



3 3 o 



Finally, differentiating V* with respect to V, we find the following 

 equation for the pressure 



L. n » + w ' Vft 5 V£l . <^! - l^!i^ 4- 2n * w ^ 



F» Pl V ft ^ 4 ft a, 8 



' ft" [ - * 



P r 'l ft 4 ft a, 



«! tv -h 2 « n 1 n 3 + « 3 n 3 2 

 2 0F 2 



The quantity 6 is proportional to the absolute temperature. 



The expression for p is of course symmetrical in the quantities 

 relating to the two kinds of molecules, and it would have been 

 possible to find the same result by arranging the spaces in a different 

 order. Our result agrees with that of Happel, the only difference 

 being in the notations. 



