Levine, Ira N. Department of Chemistry, Brooklyn College, Brooklyn, New York.
Last reviewed:April 2018
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The temperature at which the liquid and vapor phases are in equilibrium with each other at a specified pressure. At the boiling point, the transition from the liquid to the gaseous phase occurs in a pure substance. Therefore, the boiling point is the temperature at which the vapor pressure of the liquid is equal to the applied pressure on the liquid. The boiling point at a pressure of 1 atmosphere is called the normal boiling point (see illustration).
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