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True vapor pressure

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Title: True vapor pressure  
Author: World Heritage Encyclopedia
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Subject: Reid vapor pressure, Crude oil assay, Engineering thermodynamics, Oil refining, Vapor pressure
Collection: Chemical Properties, Engineering Thermodynamics, Natural Gas, Oil Refining, Petroleum Production, Physical Chemistry
Publisher: World Heritage Encyclopedia

True vapor pressure

True vapor pressure (TVP) is a common measure of the volatility of petroleum distillate fuels. It is defined as the equilibrium partial pressure exerted by a volatile organic liquid as a function of temperature as determined by the test method ASTM D 2879.[1]

The true vapor pressure (TVP) at 100 °F differs slightly from the Reid vapor pressure (RVP) (per definition also at 100 °F), as it excludes dissolved fixed gases such as air. Conversions between the two can be found here (p 7.1-54 and onwards)


  1. ^ "Standard Test Method for Vapor Pressure-Temperature Relationship and Initial Decomposition Temperature of Liquids by Isoteniscope". Retrieved 30 November 2013. 

See also

External links

  • ASTM D2879 - 97(2007) Standard Test Method for Vapor Pressure-Temperature Relationship and Initial Decomposition Temperature of Liquids by Isoteniscope
  • . Chapter 7AP-42, Compilation of Air Pollutant EmissionsUSA's Environmental Protection Agency (EPA) publication
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