106 CODUCTION. 



Q. What are the WORST CONDUCTOES of 

 HEAT ? 



A. All light and porous bodies, such 

 as hair, fur, wool, charcoal, and so on. 



Q. Why are COOKING VESSELS so often fur- 

 nished with WOODEN HANDLES ? 



A. Wood is not a good conductor, 

 like metal ; and, therefore, many vessels 

 (which are exposed to the heat of the fire) 

 have wooden handles, lest they should burn 

 our hands when we take hold of them, 



Q. Why is the HANDLE of a METAL TEA-POT 

 made of WOOD? 



A. As wood is a bad conductor, the 

 heat of the boiling water is not so quickly 

 conveyed to the wooden handle, nor so 

 quickly poured into the hand by it, as 

 when the handle is made of metal. 



Q. Why would a METAL HANDLE BURN the 

 HAND of the tea-maker ? 



A. As metal is an excellent conductor, 

 the heat of the boiling water rushes 

 quickly into the metal handle, and into 

 the hand that touches it. 



Q. How do you know that a METAL HANDLE 

 would be HOTTER than a WOODEN one? 



