56 HEAT. 



123. CONSEQUENCES OF THE LIGHTNESS 



WJtat conse- r> ,, 



qucnces remit OF VERY COLD WATER. But lOI the 16- 



from the ex- mar k a bl e fact that more cold makes very 



pansion of wa- 

 ter by cold ? cold water lighter, and not heavier, and 



thus enables it to exert the protecting influence just 

 explained, the cold of a single winter would be suffi- 

 cient to kill all the fishes inhabiting our lakes and 

 rivers. Another consequence would be change of cli- 

 mate, as a necessary result of the formation of im- 

 mense masses of ice, which the heat of the summer 

 would be insufficient to melt. The temperate regions 

 of the earth would thus become uninhabitable. Such 

 are the consequences which are obviated by this 

 remarkable exception to a general law of expansion. 

 The whole realm of nature furnishes no more remark- 

 able evidence of design on the part of the CREATOR. 



124. SOME LIQUIDS EXPAND MORE THAN 



In what pro- 

 portion do spi- OTHERS. Some liquids expand more by 



T oil,ald water heat than others. Spirits of wine, on be- 

 expand? j ng heated from 32 to 212, increases one- 

 ninth in bulk ; oil expands about one-twelfth, and wa- 

 ter, as has before been stated, one-twenty-third. It is 

 much to the advantage of the dealer in spirits to buy 

 in winter and sell in summer. Twenty gallons 

 bought in January, will have become, by expansion, 

 twenty-one in July. The difference between the cold- 

 est and warmest weather of the year, is sufficient to 

 make about this difference in bulk. 



How do gases 125 ' GASES EXPAND M R E THAN EITHER 



compare with SOLIDS OR LIQUIDS. Gases expand more 



solids and li- , . , 



quids in ex. tnan either solids or liquids by heat. The 

 t reason is, that in gases there is no co- 



