124 



HEAT OR CALORIC. 



Mr. Dalton contends that this law prevails also in solids and fluids,* 

 and Petit and Dulong have proved it with respect to several solid?. 

 The specific heat of Iron was found to be 



Centigrade. Specific heat. 



From to 100 - 0.1098 



" .0 200 - - 0.1150 



" o " 300 0.1218 



" 350 - - 0.1255 

 And so of other bodies. 



Spec, heats-, from 

 to 100 cent. 



0.0330 



- 0.0927 

 0.0507 



- 0.0557 

 0.0049 



- 0.0355 

 0.1770 



Spec heat from 

 to 30" iif 

 0.0350 



- 0.1015 

 0.0549 



- 0.0611 

 0.1013 



- 0.0355 

 0.1900 



Mercury, 



Zinc, 



Antimony, 



Silver, 



Copper, 



Platinum, - 



Glass, - 



4. " Petit and Dulong have rendered it probable that the atoms of 

 all simple substances have the same specific caloric. "f 



This is illustrated by a pretty copious table, for which see the 

 Ann. de Chimie et de Physique, Vol. 10. 



5. " A change of capacity for Caloric always occasions a change 

 of temperature. An increase of the former is attended by a diminu- 

 tion of the latter ; and a decrease of the former is attended by an in- 

 crease of the latter." 



The specific heat of the 

 cording to Dela Roche and 

 follows. 



Under equal 

 volumes. 



Atmospheric Air, 1.0000 



Hydrogen Gas, 0.9033 



Oxygen Gas, 0.9765 



Nitrogen Gas, 1.0000 



Nitrous Oxide, 3.3503 



OlefiantGas, 1.5530 



Carbonic Oxide, 1.0340 



Carbonic Acid, 1.2583 



'ases is an interesting 

 erard, several of them 



Under equal 



weights. 

 1.0000 - 

 1.2340 

 0.8848 - 

 1.0318 

 0.8878 - 

 1.5763 

 1.0805 - 

 0.8280 



problem. Ac- 

 stand related as 



Specific 

 gravities. 



- 1.0000 

 0.0732 



- 1.1036 

 0.9691 



- 1.5209 

 0.9885 



- 0.9569 

 1.5196 



* Chera. Phil, part 1. p. 50. 



t By comparing the equivalents of twelve principal metals, and of sulphur, as 

 given by Petit and Dulong, and by Dr. Turner, in his Chemistry, it has been found 

 thai the product arising from the multiplication of those equivalents into the spe- 

 cific heat of the bodies, gives results so widely differing from uniformity, as " would 

 Beem to take all plausibility froTj the hypothesis that the atoms of simple bodies har.'* 

 the same specific heat." Bache, in Jour. Jlcad. Nat. Sci. Phil. Jan. 1829. 



