CHEMISTRY AND HEAT 



57 



On the centigrade scale, the melting point of ice is zero, and the 

 boiling point of water is 100, and there are 100 divisions, or 

 degrees, between these points. On the Reaumur scale, zero 

 marks the melting point of ice, and 80 the boiling point of water. 

 Absolute Zero. It has been found by experiment that all 

 perfect gases will expand I\R of their volume when heated 

 from zero to 1 above it. It is inferred, therefore, that the 



CENTIGRADE AND FAHRENHEIT DEGREES 



ultimate limit of contraction will be found at 460 below zero 

 on the Fahrenheit scale, and that at this point all motion of 

 the molecules ceases. This point is called the absolute zero, 

 and temperatures measured therefrom are called absolute 

 temperatures. 



