42 



Mr. D. L. Hammick on Latent Heat 



taken partly from .Smiles, ' Physical Properties and Chemical 

 Constitution/ p. 112, and partly from the papers of Jaeger 

 and Young already referred to. 



Substance. 



Table III. 



y* c.c 



Xl0 8 cins. —XlO 8 . 

 V 3 



Benzene 4*61 



Ether 473 



0S 2 3-89 



CC1 4 4-70 



CHC1 3 4-39 



Methyl formate 399 



Methyl acetate 439 



Methyl isobutyrate f/02 



Ethyl formate 4'39 



Ethyl acetate 4 - 75 



Ethyl iodide 4-41 



Aniline 4'78 



Toluene 4*55 



p. Xylene 5*20 



Mesitylene 5'45 



Chlor-benzene 4"83 



Auisol 5-00 



Oxygen 304 



Nitrogen 3'21 



Argon 3-05 



Mean 



4-88 

 441 

 4-18 

 4-52 

 434 

 4-03 

 4-03 

 5-03 

 4-09 

 431 

 4-20 

 4-70 

 4-84 

 5-16 

 5-35 

 4-83 

 4-98 

 3-21 

 3-50 

 3-21 



A 

 Vi 



106 



1-19 



1-07 



•98 



100 



1-01 



•89 



100 



•90 



•90 



•96 



•99 



106 



•99 



•98 



1-00 



1-00 



•99 



1-09 



1-05 



X 10 s =1-005. 



From the principle of corresponding states it follows that 

 a similar* constancy will be found at other corresponding 

 temperatures (unless, of course, d varies with temperature), 

 and the Ramsay-Eotvos relation has therefore been deduced 

 for corresponding temperatures. It has not been shown that 



the ratio should have the same value at all corresponding- 

 temperatures ; in fact, the mode of deduction of (5) would 

 lead to the contrary expectation. Thus pY% is obviously 



proportional to ~- , which is equivalent to -~r (cf. Part I.) ;. 



the variation of h 1 with temperature is by no means the 

 same for all substances. And as a matter of fact Jaeger's 

 recent very careful determinations of surface energy show 

 that the Ramsay-Eotvos "K" does definitely vary with 

 temperature. The variation is, however, small and, as will 

 be seen in Table IV., is accounted for by equation (5) ; it 



