W. A. Norton on Molecular Physics. 71 
between their atmospheres must be less than Oc. But if th 
are subject to an external pressure urging them toward eac 
other, it suffices that this pressure should exceed the maximum 
repulsion dn, at the greater distance Od. To separate the parti- 
cles the force in operation must exceed in intensity the maximum 
molecular attraction, bm.’- 
; 
_ If heat be imparted to the two particles under consideration, 
it will obviously tend to depress the entire curve of molecular 
action, and diminish the ran , ac, of the attractive force. 
the amount be continually increased, the distances between the 
two positions of equilibrium, a and c, will eventually be reduced 
to zero, and the curve thrown entirely below the axis of ab- 
Scissas, or the effective force become a mutual repulsion at all 
intervals of distance between the particles. This would be the 
Se a ee ee ee ae ee 
Pee a a ee ee 
- Set” Ae 
full operation as fore; but, heat, by expanding the molecular 
atmospheres, should also tend to diminish the ratio of n to m, 
and therefore to modify in a similar manner the natural curye 
of molecular action. 
_4t is easy to see that a similar curve will also serve to rep- 
Tesent the mutual actions of dissimilar molecules, which obtain 
pprehension it may be well to observe here, that the re- 
ich : 
To guard against misa 
Ween t f its particles. For it must depend, not only upon the 
abbviachiien, eh also, on the number, payin and nig gic of the 
that oppose, by their attractive action, separation of the two. 
I Z icles i om the action of 
ce 
