Heat 103 



evaporation. That is why you are always cold after 

 you leave the bathtub until you are dry. The water 



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FIG. 49. Diagram illustrating how in the evaporation of water some of the 

 molecules shoot off into the air. 



that evaporates from your body uses up a good deal of 

 your heat. 



Gasoline evaporates more quickly than water. That 

 is why your hands become so cold when you get them 

 wet with gasoline. 



Since heat is required to evaporate a liquid, the 

 quickest way to dry anything is to warm it. That is 



