Specific Heat of Saturated Vapc 



537 



9. 



yoo. 



9. 



yx . 



025 



1-0804 



065 



1-1972 



•30 



10983 



•70 



1-2013 



•35 



1-1164 



•75 



1-2011 



•40 



11341 



•80 



11955 



•45 



1-1509 



•85 



1-1838 



•50 



1-1660 



•90 



1-1637 



•55 



1-1790 



•95 



1-1267 



■60 



1-1896 



1-00 



1-0000 



and on plotting these values the curve shown in fig. 1 was 

 obtained. 













Fig. 1. 













1 













































i 





















) 















































<^^ 











£ 













From this it appears that the specific heat o£ saturated 

 vapours whose 7^ > 1'202 must be of invariable sign, viz. 

 negative. No "inversion" can occur in monatomic vapours 

 such as Kg, A, He whose fy w = l*67, or in such diatomic 

 gases as H 2 , 2 , N 2 whose 7^ = 1*41, and the specific heat of 

 their saturated vapours must always be negative. For 

 vapours such as ether, chloroform, benzene, &c. whose 

 7^ < 1-202 there must be two inversion temperatures which 

 become further apart as y^ gets smaller. 



