

Relations of Li 



quids and their Saturated Vapours. 



85 



The 



quantity of heat 



absorbed or rendered latent is 



still k. 



Take 278 cubic inches of chloroform at temperature 



T, and 





! " V 



i \ \ 



Fig. 2. 





T7\e 



A C €' 



apply heat so that its volume may increase to 279, the quantity 

 of heat absorbed is still k. 



In another cluster of liquids the value of k is the same for 

 each, but it is different from the k of the first set. 



§ 10. The tangent of angle Qnl (fig. 1), termed A, is propor- 

 tional to Ceo generally in all liquids that possess n, the ether- 

 node, when Ceo is taken at absolute temperatures respectively 

 proportional to h. Most of the bodies treated by Regnault have 

 their vapour-lines directed to this point. Even mercury and 

 sulphur exactly conform to it. We may thus infer that the 

 vapour-lines of most of the bodies not experimented upon are 

 also related to the same node, but not all. 



§ 11. Water, whose vapour-line is very exactly determined by 

 the different series of observations published in the twenty-first 

 volume of the Memoirs, cuts zn produced in q, and z q=^ zn. 

 To this point, called the water-node, converge the vapour-line 



