or with (3) 
A4 Ba A 
Es UNE | 5 = Te Pk Un 8 ’ = m3 Pk UN 
: 4A : 
a pe ty Em op vy? [= pk® vy ® 
oi, : Te 
gives on the one hand the connection of the reduced virial co- 
efficients with the virial co-efficients expressed with regard to the 
theoretical normal volume as unit, on the other hand with the 
virial co-efficients expressed with regard to the normal volume as unit. 
We attribute to 2 the same value for all substances, which gives 
the advantage that in the reduction calculations the pz, and Zr, 
which generally are much more accurately known than vz, can be 
used. 
The calculations are made with the following 
Data and reduction factors. | 
7 ks! . | | Carbon 
Hydrogen. Nitrogen. Oxygen. | dion 
i ip 38.5 Orsz. 127 Orsz. | 154.2Orsz. | 304.45 Am. 
Pe 20 _Orsz. 35 Orsz. | 50.7Orsz. | 72.9 -Am. 
log D— log Ba + 5, 3.13070 2.33614 2.32890 1.88988 
log € — log Ca + 5) 2.84657 1.77625 1.84628 1.26619 
log D—log Dy + 6 3.27830 1.65646 1.88105 1.01880 
log € —log Ey +7) 3.71003 1.53667 1.91584 0.77144 | 
log § —log Fy +8 4.14176 | 1.41688 1.95057 0.52402 
The reduced virial co-efficients of all the substances together 
found in this way show already in their relation to the reduced 
temperature (rounded off in the following table) the same regularity 
as we found for the non-reduced numbers for a single substance, 
another proof, that the virial co-efficients have a real meaning. 
In the following table, in which the reduced virial co-efficients 
are combined I have omitted those which would be obtained from 
the assumed co-efficients [ | in the table of § 3 
g* 
