168 CONDUCTION. 



A. Because it gives out a much 

 greater quantity of heat in the same 

 space of time ; and the influx of heat is, 

 therefore, more perceptible. 



Q. Why does MONEY in our pocket feel so 

 HOT, ichen we stand BEFORE a FIRE ? 



A. Metal is an excellent conductor ; 

 and, therefore, becomes rapidly heated. 

 For the same reason it becomes rapidly 

 cold) when it comes in contact with a 

 body colder than itself. 



Q. Why does a PUMP-HANDLE feel intensely 



COLD in WINTER ? 



A. As metal is an excellent conductor, 

 when the hot hand touches the cold 

 pump-handle, the heat passes rapidly 

 from the hand into the iron; and this 

 rapid loss of heat produces a sensation 

 of intense coldness. 



Q. Is the iron HANDLE of the pump really 

 COLDER than the wooden PUMP itself ? 



A. No; every inanimate substance 

 (exposed to the same temperature) 

 possesses the same degree of heat. 



Q Why then does the IRON HANDLE seem so 

 MUCH COLDER than the WOODEN PUMP? 



