some New Equations derived therefrom. 



31 



changes of volume. I therefore selected all data of experi- 

 ments affording corresponding values of V c and P c , as will 

 be noticed. Values of V c and P c determined independently 

 cannot be trusted to give reliable proof. 





Vc 



Pc(exp.). 



P (calc). 



Acetic acid 



•0066 



•00713 



•01710 



•00981 



•01175 



•01334 



•01222 



01744 



•00982 



•01749 



•01482 



•01717 



•01472 



•0096 



•01455 



•00873 



•01224 



•01728 



•01464 



•00968 



■00982 



•01203 



•003864 



•00436 



•00587 



•0066 



•009011 



57-11 

 62-76 

 34-12 

 47-9 

 44-62 

 37-5 

 39-65 

 30-24 

 53 



3013 

 33-86 

 31-4 

 3829 

 4754 

 36-02 

 46-27 

 39-88 

 31-5 

 34-8 

 50-16 

 49 

 42-7 

 194-61 

 77-5 

 78-9 

 77 

 72-868 



75-7 



70 



292 



50-9* 



42-5* 



37-8 



41 



28-80 



51 



28-6* 



33-75 



29-41 



37-86 



52 



34-4 



57 



40-8 



29 



345 



51-3 



50-9* 



41-5 



130 



114 

 85 

 76 

 60 



Alcohol 









Ether 



Ethyl acetate 



Ethyl butyrate 



Ethylene dlchloride 



Ethyl isobuty rate 



Ethyl propionate 



Isobutyl acetate 



Isobutyl formate 



Methyl acetate 



Methvl butyrate 



Methyl ethyl ether 



Methyl p ropionate 



Methyl valerate . . 



Propyl acetate 



Propyl alcohol 



Propyl chloride 



Propyl formate 



H 2 0. 



N o 



so 2 



CO, 



CS 2 





We can, of course, also derive the same result* from 

 equation (Ci). 



For the critical state we have, multiplied and arranged : 



V 2 - V -4- — =0 



* c p v c~p — v> 



-L c -L C 



V c =^r± 



1_ , / J jc 



2R - V 4P „ 2 P, 



At the critical state V c adopts only one value. Hence 



Y c = 



2P, 



or 



V' 2 - - 

 Vc ~P/ 



c ~ ?y ' an Pc— y~2 —Pic 



