G4G The Specific Heat of Saturated Vapour. 



Lastly, there is Acetic Acid, which gives the remarkable 

 diagram shown in fig. 6. This is obtained by the use of 

 Ramsay and Young's values* of L, along with SchifPs 

 formula f according to which the specific heat of the 

 liquid is 



0-4440 + 0-001418*, 

 making 



<£«,= 0-1306 log 10 :T + 0;001418T-0-7054. 



The following are the calculated numbers for <p w and 4> s . 

 They show that in acetic acid the specific heat of the 

 saturated vapour has an exceptionally high positive value, 

 which it retains even at the lowest temperature to which 

 the observations extend, namely 20° C. The slope of the 

 curve there gives no promise of changing its sign at a lower 

 temperature. 





Acetic 



Acid. 





Temp. 



*»• 





L/T. 



**■ 



0° 













20 



0-0323 





0-2868 



0-3191 



40 



0-0643 





02779 



0-3422 



60 



0-0963 





0-2693 



0-3656 



80 



0-1280 





0-2594 



0-3874 



100 



01595 





0-2474 



0-4069 



120 



0-1908 





0-2401 



0-4309 



140 



0-2220 





0-2223 



0-4443 



160 



0-2530 





0-2069 



04599 



180 



02839 





01936 



0-4775 



200 



03147 





0-1808 



0-4955 



220 



0-3454 





0-1663 



0-5117 



240 



3760 





0-1524 



0-5284 



260 



0-4065 





0-1355 



0-5420 



280 



04370 





0-1148 



0-5518 



300 



0-4674 





0-0854 



0-5528 



321-6 ( 



critical) ... 









0'53 (about) 





* Young 



, loc 



cit. p. 443. 







t Schiff, 



loc. 



cit. p. 322. 





