540 13 r. R. D. Kleeman on the 



The heat of mixture of m grams of liquid 1 with n 2 grams 

 of liquid 2 is therefore 



where B 1? A T , B 2 , A 2 , Ci, G 2 , are functions of the ratios 

 T T fr Pi _£> Pl 



Icj lc 2 pc 2 pc 1 p Cl pc. 



since 



-.-(ftr.-.=(£r»*'=(&) w '» nd *= fe) 



1/3 



The form of the functions B x C 2 , as will be seen, depends 



(z T \ 

 on the form of the function <£ J — }rp - ) in the law of attraction 



\iX c x c f 



between molecules and the relative distribution of the mole- 

 cules in the mixture. As the form of the function <£ 2 is not 

 vet exactly known, we are not yet able to evaluate these 

 functions in any given case. 



The expression for the value of L 9 » can be obtained in 

 several different forms, depending on the quantity in terms 

 of which the relative distribution of the molecules in the 

 mixture is expressed. For example, if the relative distribu- 

 tion is expressed in terms of the mean distance of separation 

 of the molecules in the mixture, i. e. in terms of 



\n 1 +n 2 \M 1 ^ M 2 /J 



1'3 



where p 3 denotes the density of the mixture, L ;?1 ??., becomes 

 ??}D v /— /"-lE] n 2 E 2 N 



where D, E 1? E 2 , and F are functions of the ratios 



?JL _£s T_ _T_ 



pr } ' pc ' Te ' Tc 2 



