pa 
in $ 2. For acetic acid and such substances with a minimum asso- 
ciation near 7; the heat of dissociation of the double molecules 
must be comparatively large, namely > 7 Tr. If 3 = 0,1 for 7%, then 
À = 0,086(46 = 0). Hence with q', = 77; we have 4X (q'z: RT) = 
== 0,086. Bi ==)0;30; . so > that 73. An Vice ee 
= (fp), X 1,09, hence already >(f;),. The value 7 would then already 
increase to 7,63. For 8B=0,2 we have p= 0,76, 4 = 0,15, when 
4b =0; hence when q',= 77%, the factor of (fx), becomes — 0,76 
X 1,52 1,15, so that the normal value 7 has then already in- 
creased to 8,1. 
From what precedes we see sufficiently that at 7% the value of 
f can be both smaller and greater than the normal one. For 
mercury, g' being probably very small, 7; will be somewhat too 
small (if 8 namely differs from 0), and then at lower temperature f 
will be continually sma//er than is normal (see above). As soon as 
the dissociation to simple molecules is completed, 7 will of course 
have become normal again at the corresponding low temperatures. 
(Iu this “normal” course of f also the usual minimum in the value 
of f at about m—0,75 is included, which minimum is generally 
about 6°/, lower than f). 
After this digression, which is also necessary for what follows, 
we will determine the values of / for mercury at some tempera- 
tures below and above the boiling point on the supposition that 
Tr =1260, p, = 192 atm. We find what follows. 
t p logp, logp fio fe 
0° C. 0,00024 mm. | 8,784 2,430 5,595 
50° 0,014 7,018 2,419 | 5,57 
100° 0,270 5,733 2,409 5,55 
150° 2,684 | 4,735 2,304 | 5,51 
200° 17,015 | 3,933 2,365 5,45 
250° 74,59 3,291 2331 158 
300° 246,7 | 2 ie | 2800, jie a2 
T= ape 760,0 | 2,283 | 2983. |) 5,26 
400° 1459,6 | 1989 | 2281 | 5,25 
| 
450° 2996, 1 | 1,688 | 2270 | 5,23 
500° 5435,0 | 1,429 | 2273 | 5,23 
