582 Dr. R. D. Kleeman on Molecular Attraction 



Deductions from the Law of Molecular Attraction. 



Further results will now be obtained depending on the 

 general law of attraction given at the beginning of the paper. 

 Substituting the value of L from equation (4) in Olapeyron's 

 equation we obtain for the limiting form of tlie equation at 

 the critical point 



O 4/3 7 



=j>.+a«^3 (2 •».,)*, 



where we have put Ai=#A 2 , p 2 = xpi, and A c — a universal 

 constant — for the limiting value of A x . By means of equa- 

 tion (6) the above equation becomes 



(Sl = E( 1 -s?D = £- w « sa y' 



where M c 2 is a universal constant. The value of W c may 

 be expressed in a more convenient form. Equating the value 

 of L given by the fundamental equation (4) with that given 

 by the equation 



L = ^ ] (M 



(one of the infinite number of subsidiary equations that can 

 be obtained for the heat of evaporation), we obtain for the 

 limiting value of A 2 the expression 



(2x/^)V /37 ' 



By means of equation (5) this becomes 



H C 2 RK 4 |, 

 where H e 2 is a universal constant, and therefore we have 



Now from equations (5) and (6) we have 



JOLc m 

 This equation applied to the facts gives 



'' m'A-7 



