2o0 



500 750 



Figure 12. 



1000 



1250 



1500 



Taking from Figure 1 1 the relation TdS = sdT, we get from (9) 



dS=- 419 X 10-^ (107 + 2T) dT . . . (19) 



Integrated this gives 



S=K- (lOlT + r^) X 419 X 10-5 . . . (20) 



The value of >S' being taken, on grounds already shown, as 1429 at 

 20° C, we find the value of ^to be 1921. Accordingly the values of 

 ^S' have been calculated which are given in the following table : 



