140 
PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
Fused Salt. 
Experiments with Naphtha A. Glass 2. Temperature of the Air 12°T-12°-4. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y- 
X. 
sp. H. 
O 
O 
o 
o 
grms. 
grms. 
grms. 
grm. 
46-6 
14-5 
14-20 
11-53 
26-94 
3-745 
2-035 
0-431 
0-487 
0-234 
45-9 
14-4 
14-14 
11-56 
26-935 
55 
55 
55 
55 
0-225 
46-1 
14-3 
14-03 
11-44 
26-96- 
55 
55 
55 
55 
0-222 
44-7 
14-1 
13-83 
11-32 
26-96 
55 
2-02* 
„ 
0-228 
Mean . . . 0-227 
57. Nitrate of Ammonia, N 2 H 4 0 3 . Vitreous transparent pointed crystals, like those 
of nitre ; dried in vacuo over sulphuric acid. 
I. — Experiments with Naphtha A. Glass 2. Temperature of the Air 10°-9. 
T. 
T'. 
£. 
t. 
M. 
m. 
/• 
y- 
X. 
sp. H. 
o 
32-3 
12-7 
12-43 
10*53 
grms. 
26-92 
grms. 
2-555 
grms. 
2-41 
0-431 
grm. 
0-487 
0-424 
31-1 
12-8 
12-52 
10-66 
26-945 
55 
55 
55 
55 
0-475 
29-2 
12-6 
12-33 
10-63 
26-92 
55 
55 
55 
55 
0-482 
33-5 
13-1 
12-81 
10-74 
26-93 
55 
2-405* „ 
55 
0-473 
Mean . . . 0-463 
. — Experiments with Naphtha A. Glass 2. Temperature of the Air 14 0, 4-15 r 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• . 
y- 
X . 
sp. H. 
O 
32-4 
15-9 
15-57 
14-02 
grms. 
26-96 
grms. 
2-025 
grms. 
2-29 
0-431 
grm. 
0-487 
0-455 
30-8 
15-7 
15-44 
14-03 
26-975 
55 
55 
55 
55 
0-449 
31-5 
16-0 
15-66 
14-23 
26-95 
55 
5 5 
55 
55 
0-435 
32-9 
16-2 
15-93 
14-37 
26-97 
55 
55 
55 
0-449 
Mean . . . 0-447 
The specific heat of nitrate of ammonia between 14° and 31° is as the mean of the 
averages of both series of experiments, 0-463 and 0-447, = 0-455. The crystals were 
quite unchanged at this temperature. In these experiments the difference of temperature 
T — T' was but small, and it would not be surprising to find even greater deviations 
among the individual results than are exhibited by the above numbers in the last 
column. Nitrate of ammonia cannot be heated much above 30°, because it then 
undergoes a molecular change, which apparently is accompanied by disengagement of 
heat. This was observed in a series of experiments in which the heat was raised 
to 45° or 48°; the crystals which, dried in vacuo , were originally of a vitreous 
lustre and transparent, became, like the crystals dried at 100°, milky-white, porous. 
* After drying the stopper. 
