594 
PROFESSOR GRAHAM ON THE MOTION OF GASES. 
Table of Specific Gravities of Gases. 
Oxygen 
Nitrogen 
Air 
Hydrogen 
Carbon 
Carbonic acid 
Nitrous oxide 
Nitric oxide 
Carbonic oxide 
Carburetted hydrogen 
Olefiant gas 
Sulphuretted hydrogen 
Air =1. 
Oxygen = 1 and 16. 
Calculated. 
Observed. 
Calculated. 
Observed. 
1-1099* 
1*10563 Regnault. 
1 
16 
1 
0-9712 
0-97137 Regnault. 
0-8750 
14 
0-8785 Regnault. 
1 
1 
0-9010 
14-416 
0-9038 Regnault. 
0-06937 
0-06926 Regnault. 
0-0625 
1 
0-0626 Regnault. 
0-4162 
0- 3750 
1- 3750 
6 
1-5261 
1-52901 Regnault. 
22 
1*3830 Regnault. 
1-5261 
1-3750 
0-9375 
0-8750 
22 
1-0405 
15 
0-9712 
0-9678 Wrede. 
14 
0*8754 Wrede. 
0-5549 
0-55 5 /Thomson and 1 
° 55 [ Henry. / 
0-5000 
8 
n cnm / THOMSON and 
0"5UU1 < TT 
[ Henry. 
0-9712 
0-9852 Saussure. 
0-8750 
14 
0-8904 Saussure. 
1*1793 
1-1912 /Gay-Lussac 1 
[and Ihenard J 
1-0625 
17 
1 n-cc f Gay-Lussac and 
[ 1 HENARD. 
With the exception of the recent valuable determinations of M. Regnault and 
Baron Wrede, the calculated specific gravities are probably nearer the truth and 
more to be depended on than the experimental results found in books, which are old, 
and generally not made with that degree of precision which the science now requires. 
Capillary A. — This glass tube was thirty inches in length, and of a fine cylindrical 
bore ; it allowed 1 cubic inch of air of the usual tension, to pass into a vacuum in 
about 13 seconds. A pint-jar was exhausted, of which the capacity, including 
the vacuous spaces of the air-pump, was 4T64 cubic inches. The gas entered into 
this space, passing through the capillary, and depressed the attached gauge barometer 
in the times stated in the following Tables : — 
Table VIII. — Transpiration by Capillary A into a one-pint jar. Barom. 29-55. 
Temp. 61°. 
Gauge barometer in inches. 
Air. 
Oxygen. 
Hydrogen. 
I. 
II. 
I. 
II. 
I. 
II. 
// 
n 
it 
it 
it 
it 
28 
0 
0 
0 
0 
0 
0 
20 
150-5 
150 
166*5 
166 
71 
70*5 
12 
181-5 
182 
201 
201-5 
87 
87 
4 
321 
321 
354*5 
354 
156 
155 
2 
213*5 
215-5 
94-5 
94*5 
From 28 to 4 inches 
653 
653 
From 28 to 2 inches 
935*5 
937 
408*5 
407 
* Assigning the theoretical densities of 14 and 16 to nitrogen and oxygen, and assuming air to be composed 
of 79 - 2 volumes of the first, and 20'8 volumes of the second, the density of air will be expressed by the inter- 
mediate number 14'416 ; or, with the density of air = 1, the density of oxygen becomes T1099, and the density 
of nitrogen 0*9 71 1, both as given above. Hydrogen is calculated in the same column as-Jg-th of oxygen (T1099), 
carbon as -j^ths, carbonic acid and nitrous oxide as eachffths ; nitric oxide as the mean of nitrogen and oxygen, 
carbonic oxide and olefiant gas as paths of oxygen ; carburetted hydrogen as —g-ths, and sulphuretted hydrogen 
as piths. 
