76
THE NATURE AND
[sect. II.
On comparing the two series it will be observed, that the pressure up to the
point where the liquids change wholly into vapour is greater in the tube con
taining the least proportion of liquid; but this I expect is entirely owing to the
mode of trial not being susceptible of much accuracy. Up to the point where the
change to vapour takes place, the formula derived from Dr. Ure’s experiments
applies with admirable precision; a new formula is necessary after the change.
The formation of vapour from the mercury in the apparatus most probably affects
the results in high temperatures.
108. Ure’s and Dalton’s Experiments on Ether.
Temperature
of vapour.
Force in inches of mercury.
Temperature
of vapour.
Force
in inches of mercury.
Ure’s
experiments.
Dalton’s
experiments.
Formula,
page 75.
Ure’s
experiments.
Dalton’s
experiments.
Formula,
page 75.
34°
6-20
6-48
140°
56-90
56-4
36
7-5
6-8
44
8-10
8-25
54
10-30
10-4
150
67-60
66-9
64
13-00
150
130
74
16-10
16 1
160
80-30
78-8
84
20-00
19-83
94
24-70
24-2
170
92-80
92-5
96
30-00
25-2
173
120-0
96-9
104
30-00
30-00
Second kind
of ether.
105
30-00
3000
110
32-54
3300
180
108-30
108-1
115
35-90
362
120
39-47
39 7
190
124-80
125-8
125
43-24
43-4
130
47-14
47-4
200
142-80
146-
132
60-0
491
135
51-90
51-8
210
166-00
168-5
220
240
194-
The ether employed by Mr. Dalton boiled in a tube at 96°, 1 and will be very
nearly represented by increasing the calculated quantity one fifth for the tem
perature. Thus, for 132°, we have
49-1 + = 58-92,
5
and for 220°, we have
Dr. Ure’s ether boiled at 104° or 105°, and his experiments are very regular. 5
194
194 + _ = 232-8,
5
1 Thomson’s Annals of Philosophy, voi. xv. p. 130.
2 Diet, of Chemistry.