ON ARGON AND ITS CO.MPxVNIONS. 
71 
to measure the vapour-pressures of xenon at the boiling-point of nitric oxide and 
ethylene in the low-pressure apparatus ; but the amount ot gas at our disposal was 
insufficient. We had therefore to content ourselves with measurements in boiling 
nitrous oxide ( 183 ' 2 '’; see ‘Trans. Ghein. Soc.,’ vol. 63 , p. 836 ), in cooled ether, 
and in water. The critical temperature is 14’8'^ Cent. ; and xenon is thus li<|uefiable 
at atmospheric temperature. 
The resudts obtained by measurement are as follows : — 
Vapour-pressures of Argon, Krypton, and Xenon. 
Temperatures 
read with 
platinum 
thermometer 
and recorder. 
Licpiid nitro¬ 
gen mixed 
with liquid 
air as a re¬ 
frigerant. 
NO; atmo¬ 
spheric jrress. 
Liquid ethyl¬ 
ene, boiling 
under re¬ 
duced pres¬ 
sure. 
Hydrogen 
thermometer 
i n air space; 
pressure read 
from curve. 
T. abs. 
81- 7 
82- 1 
82- 4 
82-6 
83- 0 
83-8 
85-5 
85- 7 
86- 5 
86-6 
86- 9 
87- 3 
87-8 
123-1 
136-8 
'-137-8 
139-0 
155-.5 
j 155-7 
Argon. 
Krypton. 
Xenon. 
P. 
Ratio. 
T. abs. 
P. 
Ratio. 
T. abs. 
n 
J. . 
Ratio. 
215-0 
0-2504 
O 
84-2 
9-0 
0-3314 
1—i 
GO 
2020 
0-5008 
410-1 
0-2529 
88-6 
17-4 
0-3359 
(B. P. of 
423 - 9 
0-2536 
112-7 
386-6 
0 - 3502 
N20). 
440-1 
0-2537 
(B. P. of 
— 
— 
231-4 
11134 
0-5431 
465-0 
0-2533 
CIL). 
— 
— 
237-4 
13505 
0-5460 
485 - 8 
0 - 2537 
— 
— 
— 
239-7 
13971 
0-5495 
524 - 3 
0-2548 
— 
241-2 
14696 
0-5503 
633-4 
0-2565 
— 
244-2 
15868 
0-5525 
644-6 
0-2567 
— 
— 
— 
244-6 
16.301 
0-5512 
704-5 
0-2575 
— 
— 
— 
248 - 7 
18153 
0-5546 
716-5 
0-2574 
— 
— 
250 - 5 
18929 
0-.5548 
757-3 
0-2572 
— 
_ 
— 
252 - 6 
19984 
0-5576 
787-6 
0-2575 
— 
— 
— 
254-0 
21512 
0-5592 
821-2 
0-2582 
— 
— 
255 - 6 
21967 
0-5586 
— 
— 
— 
— 
257-4 
22310 
0-5615 
10306 
— 
— 
— 
— 
In ether bath, slow 
y warm- 
10322 
— 
— 
— 
— 
ing; 
hydrogen ther- 
10312 
0-2910 
— 
mometer. 
20700 
0 - 3009 
170-9 
11970 
0-3981 
273-35 
31501 
0-5740 
21334 
0-.3021 
C-TD, 
boiling at 
atmo- 
In water containing ice. 
23251 
0-3019 
sphei ic pressure 
stirred. 
197-9 
28808 
0-4198 
287-75 
44112 
0-5814 
201-0 
30837 
0-4229 
(Critical 
tempei-atuie and 
201-5 
31621 
0-4230 
irressure.) 
1 AOOO 
204-1 
34693 
0-4240 
■iU-^UO 
206-4 
37006 
0-4256 
In water-, stirred. 
->90-5 
41245 
0-4287 
lU tempei'atuve amt 
m-essure) 
(Critical temperature and 
])ressuret 
Hther Irath, slowly rvarm- 
' 
' 
iiig; 
hydrogen ther- 
mometer. 
On constructing the diagram in which these ratios are mapped against the 
absolute temperature of methyl alcohol, it was seen that the points representing 
ratios between the temperatures of the liquid and that of methyl alcohol at the same 
