CONDUCTION. 165 



A 1. By Conduction. 2. By Ab- 

 sorption. 3. By Reflection. 4. By 

 Radiation : and 5. By Convection. 



Q. What is meant by CONDUCTION of heat ? 



A. Heat communicated from one 

 body to another, by actual contact. 



Q. Why does a PIECE of WOOD (Hazing at 

 ONE end) NOT FEEL HOT at the OTHER end ? 



A. Wood is a bad conductor of heat ; 

 and, therefore, heat does not traverse 

 freely through it: hence, though one 

 end of a stick be blazing-hot, the 

 other end may be quite cold. 



Q. Why do SOME THINGS feel so much 

 COLDER than others ? 



A. Principally because they are 

 better conductors; and, therefore, draw 

 off the heat from our body (which touches 

 them) so much faster. 



Q. What are the BEST CONDUCTORS of HEAT ? 



A. Dense solid bodies, such as metal 

 and stone. 



Q. Which METALS are the most RAPID CON- 

 DUCTORS of HEAT ? 



A. Silver is the best conductor, then 

 copper, then gold or tin, then iron, then 

 zinc, and then lead. 



