ee 
Chemistry and Physics. 331 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PuHysics, 
|. On the Specific Heat of the Elements at High Tempera- 
tures.—In the course of their researches on the heat-relations of 
the explosion of gaseous mixtures, BeERTHELOT and ViEILuE have 
: Pressure Feat Specific heat 
Mixtures, developed, aim. evolved. Temperature. Total. For No and CO. 
25.11 126500 cal. se 28°81 9°60 
C:Na+ Oz cal. 4394 
CaNa +O. + 14N, 20°67 126500 4024 3146 8-39 
2+0;+2N, 15°26 126500 3191 39°67 7:93 
O.N1+0.4+33N, 11-78 126500 2810 45°05 7 
a 2) 34 169800 4309 39°39 9°85 
©.N.+2N,0 26°02 168400 3993 4217 8-43 
It will be noticed that the numbers obtained are closely identical 
e i i dioxide is used to effect. 
960 and with nitrogen dioxide 9°85, the ratio of N to CO being 
1:1 by volume. At 4000°, with oxygen, the specific heat was. 
found to be 8°39, and with nitrogen monoxide 8°43, the ratio of 
Nto co being 3 : 2 by volume. Moreover it will be observed 
that the specific heat increases rapidly with the temperature. 
This increase may be expressed as a function of the temperature 
y the empirical formula 
O=6-7 +.0°0016(t—2800) 
8lving the following calculated value: at 2800°, 6-7; 3200°, 7°33 
£000°, 86; and 4400° 
n 
84 and 9-6 respectively. These numbers m 
Pressing, at high temperatures and constant volume, 
War Specific heat of the simple gases, N,, H, and 
