74
THE NATURE AND
[sect. IX.
Experiments on the Force of the Vapour of Alcohol.
Force in inches of mercury.
Temperature
of vapour.
Ure’s
experiments.
Watt’s
experiments.
Robison’s
experiments.
Dalton’s
experiments.
Bettancourt’s
experiments.
By Formula
page 73.
32°
0-40
0-0
00
0-383
40
0-56
0-929
0-1
0-546
50
0-86
0-826
54-5
•48
0-986
60
1-23
0-8
1-4
1-215
64
1-51
1-41
70
1-76
1-75
77
1-62
2-228
80
2-45
1-8
2-465
90
3-40
3-41
96
4-07
4-11
99-5
3-63
4-57
100
4-50
3-9
4-64
110
6-00
5-63
6-22
120
8-10
7-12
6-9
8-22
122
7-36
8-67
130
10-60
10-73
132
10-34
11-0
11-3
140
13-90
12-2
13-85
144-5
13-7
15-48
150
18-00
17-7
160
22-60
20-71
21-3
22-4
167
24-47
25-4
26-25
170
28-30
28-1
173
30-00
29-70
30-00
180
34-73
34-
34-92
189-5
42-0
42-66
190
43-20
43-11
200
53-00
52-4
52-83
210
65-00
64-3
212
68-
66-84
220
78-50
78-5
80-20
77-81
230
94-10
93-6
234-5
105-
101-5
240
111-24
115-
112-0
250
132-30
133-2
260
155-20
157-7
264
166-10
168-6
The specific gravity of the alcohol used by Dr. Ure was *813, and its boiling
point 173°. 1 The properties of the alcohol employed by Mr. Watt are not given; 2
his experiments are very irregular. Dr. Robison’s boiled at 173; 3 and above 100°
agree well with later observations. Mr. Dalton’s appears to have boiled at 175°; 4
1 Phil. Trans. 1818.
3 Robison’s Mech. Phil. vol. ii. p. 35.
3 Robison’s Mech. Phil. vol. ii. p. 33.
4 Annals of Philo. 1820. vol. xv. p. 130.