EXPANSION OF WATER. 



351 



A. Because the earth absorbs the 

 water, and leaves the icyjilm behind. 



Q. Does not ivater expand by HEAT a& well as 



COLD r 



A, Yes ; it expands as soon as it is 

 more than 42 degrees till it boils, and 

 then it flies off in steam. 



Freezing water. 

 32o 



Here A B measures the bulk of & portion of water at 

 42 degrees. 



It goes oil increasing in biilk to C D, when it boils. 

 It also goes on increasing in bulk to E F, when it freezes. 



Q. Why do WATER-PIPES frequently BURST 

 in FROSTY weather ? 



A. Because the water in them freezes; 

 and as the water expands by frost, it 

 bursts the pipes to make room for its 

 increased volume. 



Q. 

 cold? 



WHEN does WATER begin to 



A. Water (which is wisely ordained 



na2 



