with the remainder !) 
Z = 
The case of the densities at which Z may be neglected is suffi- 
ciently important to direct special attention to the co-efficients B and C. 
ijk 
With regard toaterm —, it appeared that for the isothermals of 
Vv 
60° C. (and less decisively for those of 10° C.) of carbon dioxide 
the best agreement was obtained when J’= 0. This also decided 
the choice of even or odd terms either of which could be kept 
in the remainder. At first it seemed as if with great densities 
G 
and low temperatures a further addition of — could give a better 
Uv 
agreement, but afterwards this was found to be unnecessary. 
After 
D E fF. 
po Ato 4o tte En _. UB 
were investigated a large number of forms at 40° C. 
B 8 D E F 
ety sf ue ao! re 40° 7 
‘i De v a v(v c=) a (v at See ( ) 
C D E F 
ee «: (40° 7%) 
v(v—7) v(v—y)? vlo) vv)! 
1) It will also be possible to write VAN DER Waats’ original equation of state: 
RTb—a RTO? 
pv= RT + ; + a 1+ Z 
