880 
6, which differs little from 1, has been written by the side of 
(6 — b,)*, because x s,* d represents 6— 6, only when d is very 
small. Else we have: 
b—b, = 1/,x(s, + 2d)? —1/, w 5,3 = er (65,2 0 + 12s, d? + 80%), 
so that evidently 6 represents: 
Blad: er (68,70 A 123,0* HSO) = (1 + DAR 
sa OS ee ce TRS feos 
when 7, represents the smallest radius of the molecule = '/, s, 
(for d = 0). 
For a substance like Argon, where 6;: 6, = 2y,=1,5, r, +d 
would eg. be =7,0°1,5=1,1457,, hence 0,14 an 
a (EP jam — 0,75 (for by, = bs 
For substances as Fluorbenzene, where bj:b,=1,9, P1,9 be- 
comes — 1,239, and thus °/,, — 0,239, @= (1,258) “SS 0,635 Eas 
H, and He values will be found nearer 1. Thus for He, where 
p20, 112) wes set an — 0/0385, 2 = (1,040) "= 0/92; Kore 
we have 0;: 6, =1,2, so © = 0,063, 6 = (1,067)-* = 0,80. All these 
0 
values refer to the case that (for 7%) the atoms (sub-atoms, atomic 
groups) in the molecule have almost the greatest deviation, as bz 
does not differ much from 5,. We shall presently have to take this 
factor @ into account. 
When we compare the found expression for /’,d° with the term 
A(b —b,)? in (3), we get for the present : 
Imp? 8 
eee ge (- = tA eee 
56: P's, Nae be 
so that the quantity A in (3), in consequence of the introduction 
of 5—b,, through @ appears to be dependent on tbe extent of the 
deviation in a slight degree — in opposition to the quantity #, in 
(4), in which the original deviation d occurs. Hence A is (in a 
slight degree) both a function of the volume and of the temperature. 
Now for infinite volume, according to (3): 
Ay (by — b) =f RT, 
while according to (4): 
by — (bs) 
(6,) 
in which, as has been said, (b,) does not represent the real limiting 
volume 6,=v,, but the limiting volume extrapolated from the 
direction of the straight diameter at 7%. We saw in IV, p. 458—459, 
that e.g. for Argon 6, is = 0,305 vz, whereas (b,) = 0,286 vj. From 
OON 477, 
