Prof. Norton on Molecular Physics. 203 



when influenced by their own proper forces only, the distance 

 between their atmospheres must be less than Oc. But if they 













Fig. 1. 

















mi 



jfTTT 



1 



1 j\ 



















n 



Ob \ 



i ! i 

 i i > 



rii 



i i i 

 i i i 



1 1 \ 



I l 

 1 j 



' i 

 I ! 



N 





^ 



e 



i 



8 



9 



10 



\\ X 



1 



1 

 1 



1 



%l 



3 



* 





c~\ 





I 



i 



i 



1 



1 







H 







V 























are subject to an external pressure urging them toward each 

 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, bin*. 



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 range a c of the attractive force. If 

 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 abscissas, 

 or the effective force become a mutual repulsion at all intervals 

 of distance between the particles. This would be the neces- 

 sary tendency of the introduction of new repulsive impulses 

 into the system, even if the original forces continued in full 



* To guard against misapprehension, it maybe well to observe here that 

 the resisting force of cohesion which is brought into play when a body is 

 ruptured by a pulling force is not necessarily proportional to the intensity 

 of the maximum force of attraction between two of its particles. For it 

 must depend, not only upon the intensity of this attraction, but also on the 

 number, distance, and position of the other particles that oppose, by their 

 attractive action, the separation of the two. Incidentally the displacement 

 these particles may experience, from the action of the rupturing force, 

 comes in as a modifying cause. 



P2 



