279 
As@=1,36 is rather great, r=v,: 5. will probably lie in the 
„neighbourhood of 1,8 or 1,7 for mercury at the critical tempera- 
ture |as we shall see from the theoretical concluding part of this 
paper, this decrease is also a consequence of the degree of disso- 
ciation, however small, of the double molecules at 7, as soon as 
Aa is great). Then @ is 1,2 or 1,25 and a in the neighbourhood 
of its maximum value 4,28. 
Let us now examine the values of a, and 5, corresponding to 
the assumed critical data 7, =1700° abs., p‚ = 1100 atm., v, = 215,7. 
10-5) for different values of r. 
8 27 27 
From R7T.v,.= aa nrda-. X< 6 follows ac= 5 RT wvenr a= a X 
X 134,38.10-4:n7r6,s0 that 10* a, = 226,6: #0, when n—= 2. 
With regard to 6. we have simply be =ve:r; hence 10° be= 215,7:r. 
This gives the following values of a. and 6,. 
SS SS 
| r= | 2 ou ae ks 1,7 gine 
| | 
105 b. = 1079) tel), dl 119,8 126,9 134,8 ie 143,8 
104 a, = 83,13 90,57 99,91 111,9 121,8 | 1503 
102 Va, = 9,12 | 9,52 10,00 10,58 11,30 | 12,26 
We see from this that with »=1,8— in harmony with the 
slight degree of dissociation corresponding to the increased critical 
‚ pressure and temperature — the values 10°b, = 120, 10*a, = 100 (per 
Gr.atom) are about corresponding. Wa is then somewhat smaller 
than the value determined from the mercury halogenides at about 
mou C., viz. 10:.10—*instead of 11°. 10-2: 
By the aid of these values of a, and 6, we shall now calculate 
back the values of 7, and p. by way of check on two suppositions. 
In the first place that mercury were not dissociated at the critical 
temperature, i.e. consisted merely of double molecules (x = 0, n = 2). 
If we then suppose that 7 = 2, we should get in this case ve == rbe = 2 Xx 
8 
pot 9-9. 10-9 == 339.6. 105 (per Gr.-atom).Further RT, = a KOBE 
BON LOE 2 
198. 10-5 5 05 \ 38 28’ 
hence 7 = 4,766, 7, = 1302° abs. The following equation is then 
found for pe: ced 
‚as = 4 = 27/28 corresponds to r = 2 (see above); 
