Laic of the Rectilinear Diameter. 

 the ideal critical volume. Then 



419 



Also 

 Then 



= ft 



IV 



VJ = 3-7 V c . 



V — _5 ^f 



c " 3-7 * p; 



(?) 



(3) 



Substituting in (6), the molecular inductive power 



R T„ 



K-l 



K + 2 



M 

 d 



10 x 3-7 X P c 



8-32 x 10 ; 



10 x 3-7 x 1-014 x!0 f 



Xp 





(9) 



P c is here measured in atmospheres. The molecular 

 inductive power therefore has a constant ratio of 2*3 to the 

 critical coefficient. In Table III. following the values of 

 the molecular inductive power, the critical coefficient, and 

 their ratio is shown for a number of liquids. 



Table ITI. 



Liquid. 



Molecular 

 Inductive Power. 





T 

 M.I.P.-^— c . 

 "c 





2679 



22 



26-7 



45-24 



33-54 



402 



47-6 



30-27 



10-42 

 7-4 

 9-9 

 21-28 

 14-28 

 18-8 

 18 

 13-4 



2-56 



2-7 



2-6 



2-13 



2-29 



2-18 



2-6 



2-4 



Carbon bisulphide 



Carbon tetrachloride 



Toluene 











Mean... 2-43 



The mean value of the coefficient for the eight liquids 

 given is 2'43, which is just 5 per cent, above the theoretical 

 value. When the uncertainty of T c , P c , Y c , and K as given 

 in the tables — in some cases differences of 10 to 20 per cent, 

 occur for the values obtained by different observers — is taken 

 into account the agreement is satisfactory enough. Although 



