Chap. 6.] Experiments on Combuftion. 15 1 



In the combuftion of one pound of charcoal, 2 Ibs. 9 oz. \ gros, 

 10 grs. of oxygen gas are abforbed, and 3 Ibs. 9 oz. i gros, logrs. 

 of carbonic acid gas are formed. 



Caloric, difengaged during the combuftion of one pound of char- 

 coal - - - - -- - - 96.50000 f . 



Caloric difengaged during the combuftion of charcoal, from each 

 pound of oxygen gas abforbed - - 37.52823. 



Caloric difengaged during the formation of one pound of car- 

 bonic acid gas - - v - - - - 27.02024: 



Caloric retained by each pound of oxygen after the combuf- 

 tion ------_. 29.13844. 



Caloric neceffary for fupporting one pound of carbonic acid in 

 theftateofgas - - - - - - 20.97969. 



In the combuftion of one pound of hydrogen gas, 5 Ibs. iooz. 

 5 gros, 24 grs. of oxygen gas are abforbed, and 6 Ibs. looz. 

 5 gros, 24 grs. of water are formed. 



Caloric from each Ib. of hydrogen gas ... 295.58950. 



Caloric from each Ib. of oxygen gas - - - 52.16280. 



Caloric difengaged during the formation of each Ib. 



of water 44.33840. 



Caloric retained by each Ib. of oxygen after com- 

 buftion with hydrogen -------- 14.50386, 



Caloric retained by each Ib. of water at the tempe- 

 rature of Zero (32) -------- 12.32823, 



' When we combine nitrous gas with oxygen gas, fo as to form 

 nitric or nitrous acid, a degree of heat is produced, which is much 

 lefs confiderable than what is evolved during the other combina- 

 tions of oxygen ; whence it follows that oxygen, when it becomes 

 fixed in nitric acid, retains a great part of th'e heat which it pof- 

 feffed in the ftate of gas. It is certainly poffible to determine the 

 quantity of caloric which is difer.gaged during the combination of 

 thefe two gaffes, and confequcntly to determine what quantity re- 

 mains after the combination takes place. The firft of thefe quan- 

 tities might be afcertained, by making the combination of the, two 

 gaffes in an apparatus furrounded by ice ; but, as the quantity of 

 caloric difengaged is very inconfiderable, it would be neceffary to 

 operate upon a large quantity of the two gaffes in a very trouble- 



f All thefe relative quantities of caloric ,are exprefled by the 

 number of pounds of ice, and decimal parts, melted during the fe- 

 veral operations, 



L A. feme 



