956 
thus compelled to make use of the general reduced equation of 
state VII. 1.*) which in the region in question does not yet appre- 
ciably deviate from the special equation of state for argon VILA. 3. *) 
which might otherwise have been preferable. This comes to the same 
as assuming, that nitrogen at the reduced temperatures under con- 
sideration corresponds to ether and isopentane. 
For the calculation of the capillary corrections for the liquid 
nitrogen the observations by Baty and Donnan ®) were again utilized. 
As the normal specifie mass of nitrogen we have adopted the 
value 1.2514 germs. per Liter, as found in complete agreement by 
Rayweied *) and by Lepvc ®). 
Finally it should be mentioned, that the vapour-densities at the 
lowest 5 temperatures were not measured, but were calculated from 
the equation VII. 1. 
5. Results. The results are represented graphically in fig. 2 and 
put together in the following table. 
YIP = nn —-  — = —- ee 7 
4) 5 
lee ot t i |e | =I. 
Ee a = 5 or = +40 z La 7 Q 4R a0 
= 240° ) 205° «PP A 5 aR SO ig Sb sho TDI = Tan? fe 
— § 
Fig. 2. 
1) Comm. Leiden. Suppl. N°. 19, May 1908. 
2) H. KAMERLINGH ONNES and C A. CromMELIN, Proc. June 1912, Comm. 128. 
5) E. GC. CG. Baty and F. G. Donnan, Journ. of the Chem. Soc. (Trans.) 81 
(1902) p. 907. 
*) Lord RayLeigH, Proc. R. S. 62 (1897) p. 204. 
5) A. Lepuc, CG, R. 126, (1898), p. 413. 
