- 875 
As in the three singular equilibria (M), (A) ane (L) the same 
reaction (1) occurs: 
(5) =(5) Pix dP — 62a 
RENE MAT Ii Nae TN V) ue 
For the equilibrium (7%,) we have 
dP (AH) 
ee ZAP, 
Hence it follows: ‘ 
(G7), -( _(44)u (AH), 
4 er n ALLE V) M (AV), 
As (AJV’)jr and (AV), are positive, the second side has the same 
sign as 
(AV), QH)y—(AV)y (AH), 
As, in accordance with (4) 
(AV), =uA Vn + (AV)z and (AH), = u AH) + (AH)z 
that form passes into: 
(AV )z AA3Jy—(A Vy (AA)z = (AB)y > 0. 
Consequently it is apparent from this: 
dP dP dP dP 
EL iy pee ead kes. za 
GF, ee 5 Gale ral 
Or curve (A) must be situated in fig. 2 above curve (Z,). 
Now we take: 
(=) - AEP eest Cele 
dT OP a= {AV 3 (BV) z 
The second part has the same sign as: 
(AV )z(AA)n — (AV) (AA)z. 
When we substitute in this again the values of (AV), and (AH,, 
from 4, then it passes into w(A//)y >0. Hence it follows: 
dP dl dP dP 
df rar en Heat wei 
(a) (ae), eA ee (re), 
or curve (Z,) must be situated in fig. 2 above the prolongation of 
curve (4). 
H. Now we let the point m in fig. 1 approach more closely to 
line AZ,, so that y gets small values. As long as the changes in 
volume and entropy keep the same signs as in I, we obtain a 
P,T-diagram as in fig. 2. 
For small values of y (AV )z, (AM )z and (AH), may change their 
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