( WS") 
righthand side and we get the lefthand part of fig. 18 and then 
fig. 14 or one of the corresponding figures derived from the original 
figure of isobars of VAN DER Waals according as we are below or 
, : Zn 5 
above the temperature for which MA7 Fl for the point 6,. 
é wv 
19. Let us now examine the different possibilities ensuing from 
the supposition @,,° >> a,a,. Here we shall have to distinguish a greater 
number of cases. because we have now not only to reckon with the 
situation of the minimum of the a-line, but also with the two points 
where a= 0. When we think «°,, only little larger than a,qa, these 
points will lie close together, at least closer together than 6, and 4,. 
As first case we assume that a, lies on the right of 6,. Fig. 20, 
Fig. 20. 
which does not call for any further elucidation, shows that in the 
region of positive « and 5 no stationary point of 7; and a maximum 
of py; occurs.” 2; — Odor KSO Very low temperature the line 
dp 
ate will already be closed on the left side, while a point of 
av 
e . . dp dp Ln | . 
intersection of — —O and — =0 wiil be found near the x, where 
du dv 
pe becomes maximum. This_is in accordance with what we showed 
) ning dP ai 
in § 10, that viz. for low temperature see Use the unstable region 
Ae 
at very great wr. So we get fig. 21 for the course of the isobars, Le. 
Pd 
