and Surface Energy. 



243* 



have not been used, as such values frequently exceed the 

 " maximum " values obtained from the limiting density 

 (cf. Jeans, 'Dynamical Theory of Gases/ p. 345). The 

 values of d obtained by the various methods are given in 

 Table I. In Table II. a comparison is made between 



i-y- . -t and -4 . the various data used being shown. The 

 d J b ' to 



values taken for p, the surface energy, are, for the various 

 organic liquids, those found by Jaeger (Zeit. Anorg. Cliem. 

 1917, ci. 1-214) ; his determinations of s, the specific 

 gravity, are used, where available, in calculating V. Values 

 of Lj are derived, for the most part, from mean values of L 

 found in the usual collections of physical constants. Some 

 estimates of the molecular diameter will be found in 

 Table II. that do not occur in Table I. ; these values are 

 derived from van der Waal's "ft." J is taken as 4*18 x 10 7 

 ergs per calorie. 







Table I. 











Values of d x 



10 8 cms 









Substance. 



Rate of 

 Diffusion. 



Limiting 

 Density. 



Thermal 



Conduc- 

 tivity. 



Refractive 

 Index. 



" ft." 



Mean. 



Benzene 





5-84 





4-28 

 4-12 

 3-79 



4-53 

 4-70 



4-38 



4-88 



Ether 



4-41 



Ethyl formate 



4-09 



Ethvl acetate 









402 

 3-74 



4-58 

 4-31 



4-30 



Methyl acetate 



403 



CS 2 









442 



4-07 



3-94 



460 



448 



Chloroform 



4-34 



Carbon tetrachloride 









434 



4-69 



452 



NH 3 









2-54 



3-04 



279 



SO, 









402 



3-51 



377 



N 2 





3-46 

 4-04 



4-20 



2-88 

 2-80[E] 



3-17 

 3-40 



3-71 



CO., 



3-41 



CO 



3-72 



4-22 



3-80 



2 52[E] 



3-0S 



3-47 



CI, 





4-60 

 4-02 



360 



3-28 

 2-36 



4-96 



2-80 



4-28 



Argon 



321 



N 2 



3-80 



396 



3-82 



2-40 



3-53 



3*50 



0., 



362 



3-70 



3-60 



2-24 



2-91 



321 



Ethyl alcohol ........ 









344 



403 



o-71 



Methyl 









30G 



3-80 



3-43 



E]=from dielectric constant. 



