1813.] Specific Heat of the different Gases. 291 



Columns 1, 2, 3, 5, 6, 7, 8, and 9, of this table, point out 

 the circumstances in which the experiments were made, or the 

 result of the experiments, and require no explanation. 



The gases which passed through the calorimeter having been 

 measured at temperatures somewhat different, we have in the 

 forth column, in order to make them more capable of compari- 

 son with each other, brought the numbers of the second column 

 to what they would have been if we had measured all the gases 

 at the freezing temperature. 



The sixth column indicates the stationary temperature to 

 which each current of gas brought the calorimeter. The reader 

 will recollect that we determined this temperature by means of 

 two series of observations, one in which the calorimeter being a 

 little below this stationary temperature, the rate of the elevation 

 of its temperature was observed; another in which the calori- 

 meter being a little elevated above this temperature, the rate of 

 its cooling was equally observed. To form an idea of the way 

 of obtaining this determination, the reader may consult Note 2 

 at the end of this paper, in which are given the details of the 

 first experiment made upon atmospherical air. 



The numbers composing the tenth column have been calcu- 

 lated on the supposition that the effect produced upon the calo- 

 rimeter was proportional to the quantity of gas which passed 

 through it, and to the number of degrees of heat lost by the 

 gas— a supposition that cannot be disputed when it relates to 

 so small diherences. 



The numbers composing the eleventh column were calculated 

 by means of a formula, which will be explained in Section V, 

 which contains the experiments made upon the specific heat of 

 air subjected to different pressures. 



This last column, expressing the stationary temperature at 

 which each current maintained the calorimeter, the circum- 

 stances being exactly the same, we are entitled to conclude, 

 from the principles which we have explained, that the numbers 

 which it contains arc proportional to the specific heat of the 

 gitses. Hence the specific heat of atmospheric air being 1*000, 

 that of the gases examined is as follows : — 



Of the same bulk. Of the same weight. 



Air 1-0000 1-0000 



1 lydrogen 0-9033 12-3401 



Carbonic acid 1-2583 0-82M) 



Oxygen 0-9765 0*8848 



Azote l*oooo* 1-0^18 



• The specific heat of azotic g»s was not determined by a direct experi- 

 ment. Wr Live eauidered it as c<|iial to that of the tame balk of atmospherical 



T2 



