PRESSURE OiST THE TEMPERATURE OF VOLATILIZATION OF SOLIDS. 
43 
Temperature 
Temperature of 
Temperature 
Difference. 
of bath. 
condenser. 
of ice. 
O 
O 
O 
O 
a. Preliminary. 
Cold 
-14-9 
+ 6-6 
215 
Cold 
- 6-0 
9-7 
157 
100 
- 4'9 
9-9 
14-8 
70 
- 4-3 
8-8 
13T 
70 
- 2-7 
10-9 
13-6 
Cold 
+ 1-0 
13-6 
126 
b. Apparatus free from air . . . 
75 
+ 0-9 
+ 0-6 
+ 0-3 
75 
12-2 
11-9 
0-3 
c. x cub. centims. of air introduced 
80 
- 0-6 
5-9 
6 - 5 
(Tbe absolute amount of air 
80 
+ 0-9 
6-3 
5-4 
was not measured). 
80 
2-3 
6-9 
4 - 6 
80 
4-3 
7-9 
3-6 
80 
12-9 
15-0 
21 
d. 2 x cub. centims.of air introduced 
65 
- 8-2 
7-0 
15-2 
65 
- 6-4 
7-4 
13-8 
65 
- 5-8 
7-6 
13-4 
65 
- 4-9 
7-9 
12-8 
65 
- 37 
8 T 
11-8 
■ 80 
+ 2-1 
9-9 
7-8 
69 
3T 
10-9 
7-8 
67 
5-6 
11-8 
6-3 
80 
8-9 
14-9 
60 
e. 3x cub. centims. of air introduced 
73 
- 3-4 
121 
15-5 
11. Benzene gave a good semi-transparent block of ice, but its vapour caused the 
indiarubber connexions to leak; moreover, its rate of volatilization was so rapid that 
it only partially solidified in the receiver, even at —15°. The consequence was that 
the temperature of the benzene ice was apparently much lower than that of the ther¬ 
mometer in the condenser. Although acetic acid vapour solidified at once on reaching 
the condenser, yet the rapid current of vapour evidently warmed the thermometer in 
the condenser, for its readings are apparently too high. 
12. Naphthalene was next tried, the apparatus being in this case exhausted with 
the pump. 
Temperature 
of bath. 
Temperature of 
condenser. 
Temperature of 
naphthalene. 
Difference. 
100 
— 4°9 
73-0 
77°9 
-4-1 
73-65 
77-75 
-3-6 
74-15 
77-75 
-2-45 
74-5 
76-95 
—16 
74-75 
76-35 
-0-5 
75-15 
75-65 
+ 0-4 
75-6 
75-20 
5 } 
+ 1-0 
76-35 
75-35 
” 
+ 2'3 
76"8 
74-50 
G 2 
