306 COMBUSTION OF CHARCOAL. 



Increase of gas. The gas reduced to mean temperature and pressure mea- 

 sured 



Before the combustion, 16837 cent. cub. = 1025*29 cub. in. 

 After 17097 =1041-12 



Increase 26 15*83 



Vapour emit- The charcoal formed a light vapour in burning. The in- 

 crease of weight of the muriate of lime in the receiver, 

 after deducting that of the water absorbed from the oxigen 



Water pro- g as anc | fy om the atmosphere, was 2 cent. [0*31 of a gr.], 



the weight of the water produced by the combustion of the 



charcoal. 



Stateof the gas The gas in the receiver after the combustion consisted of 

 after corab us- 



tio«» Carbonic acid gas 1074*4 cent. cub. n: 654*26 cub. in. 



Oxigen gas 555*89 *= 338*5 1 



Nitrogen gas 60*08 2= 36*58 



Oxicavburetted hidrogen 19*33 zz 1177 



1709*7 =1041*12 



State before. The receiver contained 56*4 cent. cub. [34*34 cub. in.] 

 of nitrogen previous to the combustion, beside what be- 

 longed to the atmospheric air absorbed by the charcoal. 

 100 parts car- On calculating the composition of the carbonic acid gas 

 tein^to? 1 " from tne *" ei S nt of the oxigen, that disappeared during the 

 carbon, combustion, we find it to consist of 72*85 oxigen, and 27*13 



caibon. The calculation from the weight of the charcoal 

 consumed come6 very near this ; but as it requires a con- 

 jectural estimation of the weight and formation of the oxi- 

 carburetted hidrogen, it can be considered only as an ap- 

 proximation. 

 This charcoal This experiment is not of itself sufficient to decide, whe- 

 containedb ,th tfa both the e - ement& f t } le water existed in the charcoal 

 oxigen and hi- 

 drogen. before the combustion, or the hidrogen alone: but it is to 



be observed, that the buik of the carbonic acid produced 

 was fully equal to that of the oxigen gas consumed ; and, 

 the result being the same as that furnished by the plum- 

 bago, which formed no water, we have hence reason to pre- 

 sume, that both the elements of this fluid existed in the 

 charcoal. 



Combustion 



