OP GASES AT HIGH EXHAUSTIONS. 
413 
Table III. (continued).—Log. dec. of nitrogen gas at pressures between 1000 M 
and 2'8 M. Temp. 15° C. 
Pressure. 
Log. 
Repulsive for 
M 
decrement. 
of radiation. 
1000-0 (=0-76 m.m.) 
0-0960 
1- 
610-0 
0-0941 
2- 
459-0 
0-0934 
4- 
345-0 
0-0930 
3- 
188-0 
0-0894 
8- 
125-0 
0-0867 
15- 
84-0 
0-0820 
23- 
58-0 
0-0770 
28- 
47-0 
0-0730 
30- 
26-0 
0-0600 
25- 
13-0 
0-0420 
17- 
9-6 
0-0351 
14- 
8-3 
0-0318 
13- 
5-8 
0-0257 
9- 
3-3 
0-0207 
3- 
2-8 
0-0178 
1- 
673. The proportion between the viscosities of nitrogen and air at a pressure of 
760 millims. is according to these experiments 0’9715. Graham made it 0‘971 (706). 
674. A comparison of the air curves with those given by oxygen and nitrogen gives 
some interesting results. The composition of the atmosphere is, by bulk, 
Oxygen.20‘8 
Nitrogen.79 "2 
100-0 
The viscosity of the mixed gases is almost exactly that which would be inferred 
from the composition: thus at 760 millims.— 
20-8 vis. 0 + 79"2 vis. N 
too : 
■vis. air. 
20-8 (01257)+ 79-2 (01092) 
100 
2-61456+ 8-64072 
= 0-11255, 
100 
