Chemical and Physical Notes 



59 



TABLE VI. Giving the Tension of Saturated Steam in Milli- 

 metres and Inches, and the Corresponding Heights above 

 the Sea in Metres and Feet, for Temperatures in Faliren- 

 heit degrees. 



a given pressure. When this amount has been added and 

 dissolved, the solution is saturated and, so long as the 

 atmospheric pressure remains the same, it is impossible to 

 raise its boiling-point any higher. If heat is supplied, so as 

 to keep the solution boiling, steam escapes from its surface, 

 and crystals of salt separate out in the solution. The con- 

 dition of the boiling solution is now precisely analogous with 

 that of the freezing solution when, in the process of cooling, 



