108 Dr. R. D. Kleeman on t/w Kinetic 



for all substances at corresponding states, and ^ s / mi denotes 

 the sum of the square roots of the atomic weights of the 

 atoms of a molecule. These equations are based on the law 

 of molecular attraction : 



♦©?)• 



where z is the distance of separation between two molecules 

 and x c their distance of separation in the critical state. Sub- 

 stituting the above values of p and P n in equation (1) or (2) 

 we obtain 



T 12 m ,7« 



(3) 



where V\\ is the same for all substances at corresponding 

 states. This equation is perfectly general and therefore also 

 applies to a perfect gas. 



Table If. 



Ether, Liquid. Temp. 311° 



>6 -0907 



(Equat. 2). 



(Equat. 3). 



Benzene, Liquid. Temp. 374°-4. 



T« 



6-18xl0 2b I 6-8xl0 26 3807 



P- 



'826 



n 

 (Equat. 2). 



973x10 



(Equat. M 



8-7X10 



Ether, Gas. Temp. 311 c 



Benzene, Gas. Temp. 374°-4. 



Pc 91 11 



1U.UU0 ; ( K - T!j . °'" Grases). (Equat. 3). 



2-60-1x10 j 2-46x10 



21 



10,000" 



3-045x10 



K. Tb. of Gases) 

 3-58 XlO 21 



(Equat. 3)| 



-l 



3-52x10 



Table II. gives the values of n calculated by equation (2), 

 in the same way as before, for two substances in the liquid 



state at the temperature -^, and those calculated by 



equation (3) putting Wi=7'3xl0 31 . The table contains 



2T 



also the values of n corresponding to the temperature —£ 



o 

 and density ^° . , when the substances are in the gaseous 



state, calculated from the kinetic theory of gases, and the 



• 



