IN GASES: HYDROGEN, CARBONIC OXIDE, AND OXYGEN. 
671 
change in the quantity of oxygen added from 16 to 26 made no difference in the 
coefficient, when the mixtures were exploded at 100°, and above the critical pressure. 
The following table contains the results of these experiments. 
Table XLIII.—Pressure = 1000 millims. 
.Reference 
JS : o. 
Before the explos’on. 
After the 
explosion. 
a. 
Oxygen. 
Carbonic 
oxide. 
Hydrogen. 
Carbonic 
oxide. 
Carbonic 
acid. 
Hydrogen. 
Steam. 
104 
15-8 
24-5 
755 
21-2 
3-3 
47-0 
28-5 
4-0 
103 
17-3 
24-0 
76-0 
20'4 
3-6 
44’4 
31-6 
4-0 
139 
25'9 
24-5 
75-5 
17-9 
66 
304 
45-1 
40 
With another portion of the third mixture, containing about 26 per cent, of oxygen, 
an explosion was made under 1000 millims. pressure at 80° C. The tension of the 
steam formed in the unimpeded reaction being 451 millims., and the maximum 
tension of aqueous vapour being only 355 millims. at 80°, it follows that condensation 
of steam should occur during the explosion at the lower temperature. The coefficient 
was found to be 4 2, a result which confirms the previous experiments made on 
condensation. 
Table XLIV.—Pressure = 1000 millims. 
Kefevence 
Is 0. 
Before the explosion. 
After the explosion. 
Temperature. 
a. 
Oxygen. 
Carbonic 
oxide. 
Hydrogen. 
Carbonic 
oxide. 
Carbonic 
acid. 
Hydrogen. 
Steam. 
139 
138 
25-9 
55 
24-5 
55 
75*5 
55 
17- 9 
18- 0 
6'6 
6’5 
30-4 
302 
45-1 
45-3 
100 
80 
4-0 
4-2 
When a diy mixture of carbonic oxide and hydrogen is exploded with 12 to 15 
per cent, of oxygen, at a pressure greater than the critical pressure, and at a tem¬ 
perature sufficiently high to prevent any condensation of steam, the coefficient a is 
found to be 4 when the hydrogen is equal to or greater than the carbonic oxide, but 
3'7 when the carbonic oxide is three times the hydrogen. This difference I believe to 
be due to the fact that carbonic oxide and oxygen, under the conditions of these experi¬ 
ments, are incapable of direct combination, so that when the volume of hydrogen taken 
is less than double the volume of the oxygen, there is present during a part of the 
reaction an excess of oxygen chemically indifferent to the three other gases present— 
steam, carbonic oxide, and carbonic acid. 
