(131) 
The isothermals gave special difficulties below the critica] tempe- 
rature. Here one of the equations was obtained by means of MAXWELL’s 
criterium. Let p,, be the maximum vapour-pressure, v, the liquid 
volume and vz the vapour volume under this pressure then 
/ 1 1 
Pm (va — vo) = Al ies vd —log tv) — B ( — ) 
Ud Vy 
1 1 1 1 
belden) 
2 vd” Uy” 4 vd! Vy" 
EN ei 1 1 1 1 . 
— El mn) Pl) (7) 
6 vd Vy 8 ve v, 
AMAGAT gives for carbon dioxide the following densities 0 (in G. per 
c.c.) and maximum vapour pressures in atmospheres (Table N°, 28). 
| Oy | Od | | Pm | 
| o°! 0.914 | [0.921] | 0.096 | [0.098] | 34.3 | 
| 
10° | 0.856 0.133 44.2 | 
20° | 0.766 0.190 56.3 
| 30° | 0.598 | 10.607] 0.388 | (0.312) | 70.7 
In order to arrive at a good representation with a constant pm 
it appeared to be desirable in some cases to modify 0, and da a 
little; the values used are added in this table between brackets. 
The calculations were made by means of the equation obtained 
from (7) by using v,; the reduction of Ò to v4 was carried out 
(comp. Communication N°. 47 cont. § 2. Febr. °99) with 
10-8 
VA == resi LOTTE. 
