2 "Corresponding" Temperatures, Pressures, and Volumes. 



Mathias, and as the values calculated by M. Mathias differed 

 very slightly from those obtained independently by the same 

 method by myself, I accepted these values as correct (Phil. 

 Mag. Dec. 1892). It appears, however, that there were 

 a few small errors in the calculations, and I have therefore 

 adopted my own values in the tables that follow. The new 

 critical molecular volumes and those previously accepted as 

 correct are given below ; it will be seen that the alterations 

 are very small. 



Substance. 



Critical Molecular 

 Volume. 



Substance. 



Critical Molecular 

 Volume. 



Old. 



Corrected. 



Old. 



Corrected. 



Fluorbenzene 



Bromobenzene 



270-4 

 306-5 

 322-4 

 348-4 

 256-3 

 2761 



270-5 

 305-7 

 321-4 

 347'9 

 256-3 

 275-6 



Stannic chloride . 

 Ether 



349-3 



280-7 



170-3 



1180' 



166-9 



2176 



3504 

 281-4 

 170-5 

 118-0 

 166-9 

 217-6 



Acetic acid 



Iodobenzene 



Methyl alcohol . . . 

 Ethyl alcohol ... 

 Propyl alcohol ... 



Benzene 



Carbon tetrachloride . 



The vapour-pressures, molecular volumes, and critical 

 constants of ten esters [methyl formate, acetate, propionate, 

 butyrate, and isobutyrate ; ethyl formate, acetate, and pro- 

 pionate ; propyl formate and acetate] have recently been 

 determined by Mr. Gr. L. Thomas and myself, and the abso- 

 lute temperatures, pressures, and volumes of each substance 

 have been given in terms of its critical constants (Trans. 

 Chem. Soc. lxiii. p. 1191). 



In order to allow of a comparison being made, pressures 

 " corresponding " with the previous ones (with a few omis- 

 sions) were taken, and I now propose to give the absolute 

 temperatures and volumes of the substances previously studied 

 in terms of their critical constants. As the data for the 

 esters are published in full in the Trans. Chem. Soc, it is 

 unnecessary to reproduce them here, and it will be sufficient 

 to give the extreme values for the ten esters in each case. 



