Vapor Pressure

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The vapor pressure of a liquid is defined as the pressure exerted by the molecules that escapes from the liquid to form a separate vapor phase above the liquid surface.

The pressure exerted by the vapor phase is called the

• vapor or saturation pressure

Vapor or saturation pressure depends on temperature.

If a fluid consist of more than one component (a solution), components with

• higher vapor pressure are called light components
• lower vapor pressure are called heavy components

Temperature and Vapor or Saturation Pressure for some common Fluids

At atmospheric pressure saturation temperature of  

• water : 100^oC
• ethyl alcohol : 78.5^oC

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