42 ABT. 10. — K. IKEDA : STUDIES ON THE 



separately present the vapour pressures iz^ and tt,^ respectively at 

 tlie given temperature, the vapour pressure of the associated 

 liquid will be 



P= C,;r«+(1-C,);:p (28) 



Cx can be determined as a function of temperature from equation 

 (27), when v, D, and X are given. We may also put as an 

 approximation 



;r« = ^ e ^ 2 / 



;rp = ^ e ^ ^' ^ 



where To. and T^ are the temperatures at which the vapour 

 pressures of iS« and ©p are equal to ^. The value of b depends 

 on the chosen value of ^ as we have seen in the preceding 

 chapter. 



Now it is possible to determine the constants D, X, Ta., 

 and 7ß by means of equation (5), when the specific volumes and 

 the pressures of the saturated vapours at two diiferent tempera- 

 tures are given, provided we can hit upon the proper value 

 of V. This can certainly be done after a few trials. In this 

 case we have the following sets of equations 



<'-^) ] 



