HEAT OF VAPORIZATION 87 



Alcohol boils at 78 C., ether at 35 C., liquid air 

 at 180 C., and liquid carbon dioxide, at 80 C., at 

 standard pressure. 



62. Distillation. Distillation is a process by which 

 liquids are separated from one another or from salts 

 dissolved in them, by first making the liquid evaporate 

 rapidly by the application of heat and then condensing 



DISTILLING APPARATUS 



A, is the boiler; C, the condensing tank; D, the cold water 

 tank; and N, the distilled water. 



the. vapor. The condensed steam or vapor is the distilled 

 product. The substance to be distilled is placed in a 

 closed vessel, A, having an outlet for the vapor through 

 a tube, B. This tube passes through a cooling tank, C, 

 through which cold water is kept flowing. As the vapor 

 passes through the coils of the tube in the cooling tank, 

 it is condensed and the pure liquid flows out at N. 



