JOURNAL OF THE COLLEGE OF SOIENCE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN. 



VOL. XXV., ARTICLE 11. 



The Fusion Curves of the System 

 Naphthalene-Phenol. 



By 



T. Yamamoto, Rigakushi. 



(With 1 plate.) 



1. Introduction. 



The investigations on the vapour pressure and solidifying 

 points of concentrated solutions, whose components are avowedly 

 " normal," i.e. unassociated, have made it clear that remarkably 

 simple relations obtain in a great many cases. These are the 

 so-called ideal solutions. ^^ They are characterised by the com- 

 parative independence of their components, the chemical potential 

 of each being represented by the following simple equation : 



p. = z+RTlnC (1) 



where [x is the chemical potential of the component in the solu- 

 tion, z the same in the pure state, and C the molar fraction, or 

 numerical concentration as Habek prefers to call it. R and T 

 have the usual meaning and stand for the universal gas constant 

 and the absolute temperature. The equation applies of course 

 more or less approximately to actual cases, because the conditions 

 upon which it is based are never fulfilled absolutely. These 



1) See the foregoing article. 



