( 139. ) 
m, 90,0013 
— & p. 
ao) 28,8 
GAN 
. . DM 2 . n e 
If we neglect unity toe ”, we may derive from these two equations : 
uw, d, 28,8 1 
e n — @ Een, 8 
m, 0,0018 ap, 
4.6 
If swe. put in. this” equation, Jd, — 1, m,=18 and es ae 
7 
Atmospheres, and a = 0,02 as is the case for .V,, then we find for 
uy, a value between 16 and 17. This result shows that the equation 
Uy = (Lr) — (Ter) Ng} 
ag 
273 
does indeed hold as an approximation. 
If we had chosen as second component a substance of small 
volatility and whose 7, is much higher than (7), then we might 
form an idea of the value of wt’, by making use of the approximation: 
' jn 7 a al 
ne hoe): a= CP wats 
EN 
but then we should find a very great negative value for u’, and 
‘ y DM : : : 3 
for S ==e Ya value which differs only slightly from zero. 
Yi 
When we add a third component to a binary system whose com- 
position is determined by w,, then we have found for the value of 
Wd, ees : 
—-—, if y, is infinitely small: 
p dy, 
1 dp en " " 
p dy, —1+(#,—#,)o tue a a, — Lo x i 
ie sa A 
le, dere 
The two branches of the pressure-curve of this section do not start 
in the same point and so they differ already from the beginning from 
those of a binary system. Only if (w‚—), = 0 they start at the same 
point. But as the factor of v,—v, depends on the curvature of the 
u surface the influence of this term may be neglected specially when 
wy is great or when the curvature is considerable. So we find for 
1 dp : ; 
the value of x, for which — —- vanishes approximately : 
p dy, 
/ 
gdh et 
xy —- away 
dio etl 
Only when ,,<w,, this yields a possible value for 2, at least 
if as well u, as wz, are positive. 
by 1 
