Temperature and Molecular Attraction. 

 Table II. — Values of C (continued). 



97 



1 



Ammonia. 



Sulphur 

 dioxide. 



Carbon 

 dioxide. 



Nitrous 

 oxide. 



Av. 0. 



1622 



1-707 



1-762 



1-513 



Temp. 

 -30° 



1-608 





1-738 





-20 



1-615 





4- 



1-789 



1-503 



-10 





1-712 











1-622 



1-712 



1-760 



+ 

 1-637 * 



20 



1-629 







1-679 



1-682* 



1-521 



40 



1-634 



1697 







60 





1-670* 







80 





+ 

 1-750* 





... 



100 





+ 

 1-724 







120 





4- 

 1-736 







140 





+ 

 1-818* 







Crit. temp. ... 



131° 



156°-0 



31°-35 



38°-8 



The results shown in Table II. justify the conclusion that 

 at very low vapour pressures the equation X = CRTln^r pro- 

 posed by Dieteriei is not exactly true. The remarkable, and 

 apparently exact, agreement with the facts given by tlds equation 

 at higher temperatures deserves the closest attention and study. 



For a discussion of this equation the papers by Dieteriei, 

 Richter, and the author, already cited, should be consulted, 

 and a later study by W. Steinhaus* has just appeared. The 

 equation undoubtedly marks an important step forward, and 

 must aid greatly in understanding the theory of liquids. 



Part III. — The Relation of Temperature and, 

 Molecular Attraction. 



In the series of papers cited I have held that the most 

 direct and natural interpretation to give equation 1 is that 

 it is caused by a force among the individual molecules 

 following the law r 



fjjn 



...... (2) 



* Inaugural- Dissertation, Kiel, 1910, " Studien zum Problem der 

 Zustandsgleicliung." 



Phil Mag. S. 6. Vol. 22. No. 127. July 1911. H 



