( 1015 ) 
ND B PI 
| Virial coéfficients for argon according to VII. 1. 
| / WE 
t | B - 10° GeO | Dil AMI Pr AOR Re ee. MOS: 
4+. 90.36C,) —'0.61763 | + 2.21916 | 4 4.398NG | J- 7 6045 | — 4 35430 
0 coc. = TTORBO SEs 4908) | 4H 0OBAD | 8732 |e 08937 | 
— 57.72C.) — 1.30816 | + 2.4% 67 — 0.67139 | + 10.5955 | — 5 02405 | 
SANNE at ba AN) 1 BAMA te AD SOB 5.93044 
— 102 5IC.| — 1 89979 | +- 3.04873 | — 4.10121 | + 10.4013 | — 3 10842 
— 109.88C.| — 2 02794 \ + 3.25078 \ — 4.76310 | + 10 3251 | — 2 69045 ! 
= 418.80G,| — 2.40156] 42 3 37635 | — 5.13509 |.4 40.9047 | — 2 47655 | 
— 145.86C.| — 2.14198 | + 3.44818 | — 5.35020 | + 410.9837 | — 2.35600 
— 116.62C.) — 2.15723 + 3.47581 | — 5.415381 | + 10.2806 | — 2.31432 
— 1 19.2CC,| — 2.21026 | + 3.57411 |) — 5 67996 | + 10 2759. | — 2.17669 
— 120.24.) — 2.23230 |F 3.61597 | — 5.78950 | +- 10.2764 | — 2.42930 | 
— 121.21C) — 2.253818 + 3.65616  — 5.89340 | + 10.2783 | — 2 07246 
— 130.38C.| — 2 46836 | + 4.1002! | — 6.96374 | + 10.3966 | — 1.66293 | 
— 439 69C.| — 2.79584 | -- 4.69951 | — 8.97734 | -++ 10.8045 | — 1.42979 
= 449.6CC,| — 3.06753 | 4 5.59979 | 10. 15136 | + 41.8440 | — 4.53064 | 
oe v; only the critical temperature and pressure are used in 
k 
the calculation of 2v, while, when different substances are being 
compared with each other a single but undetermined value is ascribed 
to 4 for all substances. This method which has already been adopted 
on former occasions *) has the great advantage that it is not necessary 
to use the critical magnitude which is most uncertain, viz. the critical 
volume, and only well defined magnitudes are employed. To make 
4 the same for all substances, although it varies distinetly for the 
various substances *) may well appear somewhat strange at first sight. 
The systematic deviations of the various equations from VII. | 
revealed in the different values of 4 are not, however, the only 
systematic deviations to which expression will here be given. There 
1) Proc. June 1901, Comm. NO. 71, 
2) Proc. Febr. 1907, Suppl. N°. 14. 
