[1] : The Collaborative International Dictionary of English v.0.48

vapor pressure \vapor pressure\ or vapor tension \vapor tension\
   . physics
   the pressure or tension of a confined body of vapor of a
   chemical substance in equilibrium with the solid or liquid
   form of the substance. the pressure of a given saturated
   vapor is a function of the temperature only, and may be
   measured by introducing a small quantity of the substance
   into a barometer and noting the depression of the column of
   mercury.
   webster 1913 suppl. +pjc

[2] : WordNet (r) 2.0

vapor pressure
     n : the pressure exerted by a vapor; often understood to mean
         saturated vapor pressure the vapor pressure of a vapor
         in contact with its liquid form syn: vapour pressure
see also:
vapour pressure 

Pressure >> P Words
Pressure, definition of term: Pressure
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Pressure Cooker >> P Words
Pressure Cooker, definition of term: Pressure Cooker
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Pressure Group >> P Words
Pressure Group, definition of term: Pressure Group
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High Pressure >> H Words
High Pressure, definition of term: High Pressure
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Blood Pressure >> B Words
Blood Pressure, definition of term: Blood Pressure
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Air Pressure >> A Words
Air Pressure, definition of term: Air Pressure
air+pressure_pag1.html