291 
e. Krypton. 
Formula (2) yields with 1/210,6 = 14,51 the value 2y = 1,5514, 
y = 0,776, giving: 
= xX 0404 | == 1.55)(L.— 0,216) == 15216, 
as m, = 104,1 : 210,6 = 6,494. 
“Now Ramsay en Travers!) give the density 2,155 for 127°,1 abs. 
(m = 0,6035). The factor f corresponding with this temperature is 
f = 1,551 (1 — 0,437 X 0,6035) = 1,551 (1 -- 0,264) — 1.142. 
With D= 2,155 corresponds v = 171,7 X 10-5, so that bj, would 
become = 196 X 105, while 177 X 10-5 was found directly from 
Tr and pj. The given density is therefore too small. 
We find for the product ;-< a, : 
Frens = a0 52025 4,46: 
f. Xenon. 
From the experiments of Parrerson, Cripps and Wuryrraw GRAY 
(1912) follows y— 0,780, while from (2) is calculated 2y = 1,6468, 
== Kadans sen — 47-02: 
With y= 0,780 we find from */, d, =1 + y (1 — m‚), in which 
m, = 133,1 : 289,7 = 0,459, for d, the value 2,843. Hence the value *) 
3,281 is found for D, with Dj, —= 1,154, hence v, = 177,1 « 105. 
Now 
0,78 
f, = 1.560 k in 0,459 | — 1,560 (1 — 0,201) = 1,246. 
nf 
Hence 6; becomes = 221 Xx 10 5, while the value 228 « 10-5 
has been directly found from 7%, and py. 
We have further: 
FX ty = 1,246 X 2,18 
bo 
ll 
= 
g. Niton (Radium-emanation). 
We can again calculate the value of y from V 7; ='377,6 = 
= 19,43, which gives 2y —1,738, y= 0,869. For the boiling 
point, where D —1: 0,2281 — 4,384, hence v = 226,3 X 10— has 
been found by Rvporr (1910) (all the other recorded values 
1) Zeitschr. f. physik. Ch. 38, 674 (1901). 
2) Some time ago RAMSAY and TRAVERS (loc. cit.) found D= 3,52 at 1719.1 
abs. As for the boiling point (166°,2 abs.) the liquid density was found only = 3,06 
by P., C., W.G., D must be found somewhat smaller than 3,06 for 171°,1. In 
his interesting study on the periodic system (Zeilschr. für physik. Ch. 76, 577 
(1911)) Baur is very near the truth, when he surmises that the much too high 
value 3,52 must be replaced by about 3,07. 
19* 
