37 
1917-18.] Thermodynamics of Adsorption. 
Hence, when a =100, from (20'), 
and when a = 63, 
l d_A 
A da 
= '062/36 
= ■0017-, 
1 -041/25 
A da 
= •0016-. 
Q. > 100 
when a = 82, 
a - 3 A ( A &)/ T ^- 061x -° 0oi / 37> <- 0017 
whence, from (21), 
= *0008, 
l dA 
A da 
*0014 more nearly. 
This leads to A2 = — 8 from (20'), but if we calculate a series of values 
of A2 and hence evaluate the integral in (20), we get AE=— 6. The 
results of such an evaluation are shown in Table IV, where it is assumed 
that A2= — 6 0 when a = 82. 
