ON EVAPORATION AND DISSOCIATION. 
153 
Orthoharic Volumes of 1 Gram of Vapour. 
Tempera¬ 
ture. 
Volume 
of 1 grm. 
Specific gravity 
(mass of 1 c.c.}. 
Vapour- 
density. 
Tempera¬ 
ture. 
Volume. 
Specific gravity. 
Vapour- 
density. 
O 
80 
c.cs. 
958’0 
0-00104 
30-50 
1°80 
C.CS. 
44*50 
0-0225 
37-6 
90 
643-0 
0-00156 
30-90 
190 
35-40 
0-0282 
38-9 
100 
443-0 
0-00226 
31-30 
200 
28-30 
0-0353 
40-5 
110 
312-0 
0-00.320 
31-80 
210 
22-65 
0-0442 
42-7 
120 
225-0 
0-00443 
32-40 
220 
18-00 
0-0556 
45-6 
130 
165-0 
0-00605 
33-00 
230 
14-21 
0-0704 
49-5 
140 
124-0 
0-00805 
33-70 
240 
11-06 
0-0904 
54-9 
150 
93-9 
0-01060 
34-50 
250 
8-50 
0-1180 
62-1 
160 
72-3 
0-01380 
35-45 
260 
6-20 
0-1610 
74-4 
170 
56-4 
001770 
36-45 
The following table gives the densities of the unsaturated vapour at equal intervals 
of temperature and pressure. 
Pressure. 
Temperatures. 
130° 
0 
O 
180° 
200° 
220° 
230° 
240° 
250° 
260° 
263°-64 
270° 
280° 
mms. 
2,000 
32-49 
31-95 
31-59 
31-33 
31-11 
30-99 
30-93 
30-80 
30-70 
4,000 
34-41 
33-06 
32-46 
32-04 
31-86 
31-71 
31-50 
31-.32 
6,000 
34-80 
33-75 
33-02 
32-76 
32-52 
32-16 
31-89 
8,000 
37-02 
35-19 
34-17 
33-73 
33-39 
32-90 
32-50 
10,000 
37-11 
35-43 
34-86 
34-38 
33-66 
33-12 
12,000 
39-42 
36-93 
36-16 
35-50 
34-51 
33-78 
14,000 
38-85 
37-74 
36-84 
35-48 
, ^ 
34-47 
16,000 
41-26 
39-63 
38-41 
zi-u 
36-51 
35-86 
35-23 
18,000 
44*40 
41-97 
40-23 
38-89 
37-72 
36-84 
36-06 
20,000 
45-00 
42-30 
40-47 
39-00 
37-89 
.36-97 
22,000 
48-99 
44-94 
42-33 
40-51 
39-10 
38-02 
24,000 
48-42 
44-70 
42-25 
40-48 
39-15 
26,000 
53-76 
47-70 
44-28 
42-03 
40-41 
28,000 
51-66 
46-62 
43-83 
41-82 
30,000 
57-90 
49-80 
46-02 
43 38 
32,000 
, , 
54-66 
51-90 
48-72 
45-24 
34,000 
61-80 
56-97 
52-11 
47-43 
36,000 
64-32 
56-40 
50-01 
38,000 
, , 
. . 
62-64 
53-16 
40,000 
. . 
57-12 
42,000 
1 
” 
62-40 
Heats of Vaporization. 
The heats of vaporization are calculated from the thermo-dynamical formula, 
L dp t 
dt fj 
MDCCCLXXXIX.-A. X 
