W. A. Norton on Molecular Physics. [7 
The heat of fluidity is consumed in forcing up the molecu- 
lar atmospheres. As a final result of the liquefaction, these 
atmospheres remain in an expanded condition. The effect of 
this expansion is to diminish the values of v given by equ. (1) 
(see p. 68), and increase the distance Oa, fig. 1. The actual 
distance between two contiguous atmospheres is less than the 
increased distance Oa, by reason of the compressing force that 
takes effect throughout the liquid mass. But the ultimate com- 
pression imparted to the individual atmospheres will depend 
In a great degree upon the final value of the attractive action, 
v, between the molecules, and may therefore still be less than 
t which obtained in the solid state. In this diminished value 
in the general survey we are now taking need not be considered 
etail. The mass of molecules and their individual atmos- 
vapor resting upon them. The cooling effect of the evaporation 
Is to be attributed to the expansion which the electric atmos- 
heres experience, on being freed from the compressing forces 
5 
Previously existing. 
as It is apparently not necessary 
e 
 ~part The equilibrium may be a dynamical one, the vapor may be continually 
_ ‘Msing at segs a of the salty and continually passing back into the liquid 
3 at other poi he condensat 
jon compensating exactly for the evapo- 
