HEAT AND EXPANSION 



109 



and the specific heat higher than those of metals. For this 

 reason they require more heat to produce a given rise in 

 temperature than do the metals. 



The expansion of a number of common substances used 

 in building construction is given below. 



LINEAR EXPANSION OF SOLIDS AT ORDINARY TEMPERATURE 



There are a few substances, of which water is perhaps the 

 most common, that do not follow the rule of expansion and 

 contraction. When a body contracts, its density, and there- 

 fore its weight per cubic inch or cubic foot, increases and we 

 say that it becomes heavier. Water freezes at 32 F. and 



