( 158 ) 

 We may also write the second member of (3) as follows : 

 I dl^ / 



uib c b' (c—bydi,'^ 



^' \l~c~~b ^''~ ' ~tLv ¥~d~f\ ~ 



a a a 



«— a I— (I loii — 



b , ,„ b^ i'—b -^ b . . . . U) 



d.v d,v V (Lv 



In order to examine Uie general valne of the qiianlilv which is 



to be reduced, we have to distinguish two cases. The first case, 



that V — h is small and p (v — b) may be neglected compared with 



A/RT. In this case (4) may be simpliiied to: 



a a 



d- ill- 



db b .„ b^ 



p 1- MRT 



(If d.v dx 



The second would hold for high pressures; then the value of 



p {p — b) approaches (o MRT, when v approaches to b. In this 



case (4) is simplified to: 



a 

 d~ 

 db b 



P T-' 



ax ax 



As we assume coexistence with a rarefied gaspliase we have only 



to deal with the first case. In tiie second there would not even be 



question of coexistence with a second phase. We find now for the 



formula, giving the relation for the concentration of the two phases : 



(a a -X 



d dl-\ 



lb b' I 



,—.,^ .o., MRT 'd^ d^^^ 



, -. - --. . . (5) 



in which p — is neglected, or rather where it is cancelled by an 



dx 



almost equal value, which ^vould occur in the second member of 

 the equation given at the beginning of this paper. 

 Let us put: 



and 



