426 On the Capacity for Heat, or 



when the quantities of these two liquids are estimated by 

 their weight ; and, if we designate the calorific power 

 of water by i, the calorific power of oil of olives will 

 be expressed by a fraction under i. 



The power with which any given body, solid or 

 liquid, being at a given temperature, resists the calorif- 

 ic or frigorific action of bodies warmer or colder than 

 itself, is in proportion to its calorific power; and the 

 greater is this power, the longer it resists these actions 

 of surrounding bodies. 



If, under equal surfaces, a pound of water and a 

 pound of oil of olives, both at the same temperature 

 (96 F.), are placed at the same time in a place where 

 the temperature is lower (that of freezing, .for instance), 

 the oil of olives will be cooled much more rapidly than 

 the water. 



If it be in a warm place that the two liquids are 

 exposed, the oil of olives will still have its temperature 

 most rapidly changed ; it will be more heated than the 

 water. 



In two cylindrical glass vessels, of equal size and very 

 thin, place equal quantities of water, and at the same tem- 

 perature (96 F.). 



A piece of lead weighing a pound, and a piece of cop- 

 per of the same weight, having been cooled in a mixture 

 of pounded ice and water, remove them from this cold 

 mixture and plunge each of them suddenly into one of 

 the vessels of water. 



The two masses of water will be cooled, but that 

 which contains the copper most, for the calorific power 

 of copper is greater than the calorific power of lead. 



We may also say that the frigorific -power of copper is 

 greater than the frigorific power of lead, and, in the case 



