14 ART. 10.— K. IKEDA : STUDIES ON THE 



To begin with a binary mixture, let the initial conditions 

 of the sohition be as follows : 



JVj = number of mois of (2^ 



P^ = vapour pressure. 

 Then Ave have 



p -^1 p I -^2 p . 



hence if the initial pressure be given, the composition can be 

 calculated by the following equation 



and if the initial weight of the solution be known, N^ and iVa 

 can be determined. 



At any moment let the pressure be P and the number of 

 mois of the components in the residue be n^ and 7u respectively. 

 Then in the infinitesimal evaporation the follow^ing relation must 

 hold: 



dn, : chu = (7/ : CJ 



But by the equation (5) we have 



fi,_P^Vh_ ,; _ P. n. . 



P n^ + iu' - P 7^1 + »o 



hence 



1 (h\ _ 1 (?^^2 



which on integration becomes 



"ö' 





