462 
SIR ANDREW NOBLE: RESEARCHES ON EXPLOSIVES. 
The correctness of this equation for temperatures up to 800° C. has been proved, 
and assuming that the same equation holds up to 1300° C., the specific heats for each 
100 degrees are given below. 
o o 
0 , 
temperature. 
Specific heat, 
constant pressure. 
An 
a 2 . 
°C. 
0 
100 
0-2028 
0-2162 
0-0134 
o-ooio 
200 
0-2286 
0-0124 
o-ooio 
300 
0-2400 
0-0114 
o-ooio 
400 
0-2504 
0*0104 
o-oon 
500 
0-2597 
0-0093 
o-ooio 
600 
0-2680 
0-0083 
o-ooio 
700 
0-2753 
0-0073 
o-ooio 
800 
0-2816 
0-0063 
o-ooio 
900 
0-2869 
0-0053 
o-ooio 
1000 
0-2912 
0-0043 
o-ooio 
1100 
0-2945 
0-0033 
o-ooio 
1200 
0-2968 
0-0023 
o-ooio 
1300 
0-2981 
0-0013 
o-ooio 
1400 
0-2984 
0-0003 
It will be observed from this table that, although between 0° C. and 1400° C. there 
is a large increase in the value of the specific heat, yet the increments per 100 degrees 
are rapidly decreasing, vanishing altogether at about 1400° C., at which temperature* 
there would be partial dissociation at atmospheric pressure. The temperature 
would, however, probably require to be considerably higher at the pressures we are 
considering. 
The specific heats given are, as I have said, those for constant pressure, and to 
obtain those at constant volume it is necessary to divide by the constant k connecting 
the specific heats of gases and vapours at constant pressure and constant volume. 
I give below the values I have used (1) of the specific heats at constant pressure— 
these are taken either from TIolborn and Austin’s paper, or from Landolt- 
* Mendeleef, ‘Principles of Chemistry,’ vol. 1, p. 381; also Deville, ‘Comptes Rendus,’ vol. 56, 
p. 729; and Berthelot, ‘ Comptes Rendus,’ vol. 68, p. 1035. 
