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From: Webster's Revised Unabridged Dictionary (1913)

 Vapor pressure or 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.
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