SPECIFIC HEAT OF OASES. 
19s 
beat as 620‘8 grammes of distilled water. Now, it results 
From the experiments made on the air, and presented in the 
lecond table, that 83’20 litres of air, or 108 32 grammes, in ex- 
periencing a lowering of its temperature of 85°, rai-.es the 
temperature of the calorimeter or 620 8 grammes of distilled 
water at 4* : we find by this, by means of a simple calculation, 
that the specific heat of water being J, that of air is0 2697. 
The determination of the specific heat of air by these three 
processes, leads to results very near to each oilier, and, taking the 
medium between these three, we find 0 2669. But in adopt- 
tig for the proportions of the specific heat of gas to that of 
lir, those to which we have been conducted by our first experi- 
ments, we have constructed the following table of the specific 
leats of tlie different gases. 
Under the pressure of 0 /6, 
Specific heat of water - - roOOO 
atmospheric air O 2699 
hydrogen gas - 3'2936 
carbonic acid - 0‘2210 
oxigen - - 0’236l 
azote - - 0’2754 
olefiant gas - - 0'4207 
oxide of carbon 0’2884 
aqueous vapour O' 8470 
Section IX. 
General Considerations. 
These are the principal results to which the experiments de- General consi- 
jailed in this memoir lead. derations, 
list. The specific heat of gas is not the same in all, whether 
rve have respect to the volume or to the weight. 
2d. The specific heat of atmospheric air, considered with 
respect to its volume, increases with its density, but following 
illess rapid progression. Consequently, considered with re- 
Vot. XXXVI.— No. 167. P »pect 
