( 34 ) 
Graphically the isotherm T= 0 is indicated by the straight line 
FE y i. e. the vertical axis v — 2 b, = 1); the curve ED along 
which 0 changes from 1 to 0; the straight line DC, i. e. the vertical 
axis v = b 1 (Ji — 0); and finally the horizontal straight line CB, 
which does not meet the horizontal axis p = 0 before v = oo. 
The direction of the curve ED is found from the general equation 
(7) of Part I (p. 778), by putting (p = oo (see above), (so v — b is 
all through the change from £ = 1 to £ = 0 constantly = 0, hence 
v = b). Then we get: 
dp_2a (1 +p)RT 1 
(v-by ’ 
or as (v — by<p * = (1 -f- £)* (— A by : 
dp_2a 2RT 
fo-T*~p(i-F)(-Lby' 
So along ED we have for T=0: 
dp _2a 
dv v l * 
hence: 
(±) = W = 5f... 
\dv) E (2 by ’ by 
As now (see above): 
the curve ED will rise more rapidly at E than the connecting 
line ED, and less rapidly at D. 
Since according to equation (8) the limiting pressures p E and p Q 
will approach to finite values for T— 0, the coexistence pressure 
solid-liquid, which at all events must lie between p E and p D , must 
also possess a finite value for T— 0, so that in Fig. 4 of the plate 
of Part I the line SM cannot under any circumstances ascend to 
=(-*»)[/£, ; 
So at T= 9 for our substance = Vs ^252 = 7,9 ; <P D = ^ =0,0011. 
And for p we may write: 
which yields 290 — 2400 = 2110 ; p J) = 0,03 for T=9. 
All these values harmonize perfectly with those found in the table. 
