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.