PROFESSOK W. RAMSAY AND DR. M. AY. PRAYERS 
7(i 
Liquefaction of Xenon condensed in Ethylene, boiling under Atmospheric Pressure. 
Xenon D = r)4‘0. 
Volume of 
ga.s 
uncomleused. 
T emp. 
Pressure. 
A^olume at 
N.T.P. 
A^olume 
condensed. 
Volume of 
liquid. 
AVeight of 
1 cub. 
centim. 
1 
2 
3 
4 
4-95 
4-85 
3 • 95 
3-20 
O 
12-2 
n 
11-7 
Alean \ 
1268-5 
1268-5 
1268-5 
1279-4 
reight of 1 cu 
15-13 
15-03 
14-50 
13-62 
'I. centim. ; 3 
3- 96 
4- 06 
4- 51 
5- 47 
-52 grammes. 
0-00630 
0-00644 
0-00739 
0-00915 
3-59 
3-60 
3-50 
3-42 
The temperature of the xenon was 171° ahs. ; its boiling-point at 760 millims. is 
163-'.)° ahs. 
Although these determinations of density have not been made at the actual 
boiling-points under normal pressure, still they are sufficiently near to show 
correspondence. The atomic volumes may he obtained by dividing the atomic 
weights of the elements by their densities. They are :— 
Argon: 39-9/1-212 = 32-92. 
Krypton: 81-55/2-155 = 37-84. 
Xenon: 128-0/3-52 = 36-40. 
The Relations between the Volume, Ihinperature, and Pressure of the Inactive (rases. 
The experiments l)earing on this (piestion were carried out in an a})paratus similar 
to that of which a figure is given in the ‘Phil. Trans.,’ A, 1887, p. 59. The volume- 
tube, carefully calibrated, was charged with a known volume of gas, accurately 
measured under known conditions of temperature and pressure, and introduced 
without contamination. The helium was a ])ortion of what had been fractionated 
by diffusion from any admixture of ai’gon, and it had the density 1-98 ; the argon 
was free from helium, neon, krypton, and xenon; they had been removed by 
fractional distillation ; the neon, krypton, arid xenon were pure samples of these 
gases, with densities, 9'97, 40-8, and 64, respectively. Before use, the krypton and 
xenon were solidified, and freed liy the jumip from any admixture ot gas with higher 
vapour-pi'essure. 
The method of filling the volume-tube requires special description. It will he 
understood by reference to the figure (fig. 7). 
Tlie volume tube A was sealed with a constriction at B to the apparatus 0, 
