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Reid vapor pressure (RVP) is a common measure of the volatility of gasoline
Gasoline

File:GasCan.jpgGasoline or petrol is a petroleum-derived liquid mixture, primarily used as fuel in internal combustion engines.It consists mostly of aliphatic hydrocarbons, enhanced with iso-octane or the aromatic hydrocarbons toluene and benzene to increase its octane rating....
. It is defined as the absolute vapor pressure
Vapor pressure

Vapor pressure , is the pressure of a vapor in Thermodynamic equilibrium with its non-vapor Phase s. All liquids and solids have a tendency to evaporate to a gaseous form, and all gases have a tendency to Condensation back into their original form ....
 exerted by a liquid at 100 °F (37.8 °C) as determined by the test method ASTM-D-323. The test method applies to volatile crude oil and volatile nonviscous petroleum liquids, except liquified petroleum gas
Liquified petroleum gas

Liquefied petroleum gas is a mixture of hydrocarbon gases used as a fuel in heating appliances and vehicles, and increasingly replacing chlorofluorocarbons as an aerosol propellant and a refrigerant to reduce damage to the ozone layer....
es.

The Reid vapor pressure (RVP) differs slightly from the True Vapor Pressure
True vapor pressure

True vapor pressure is a common measure of the volatility of petroleum distillate fuels. It is defined as theequilibrium partial pressure exerted by a volatile organic liquid as a function of temperature as determined by the test method ASTM D 2879....
 (TVP) of a liquid due to some small sample vaporization and the presence of water vapor and air in the confined space of the test equipment, i.e.






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Reid vapor pressure (RVP) is a common measure of the volatility of gasoline
Gasoline

File:GasCan.jpgGasoline or petrol is a petroleum-derived liquid mixture, primarily used as fuel in internal combustion engines.It consists mostly of aliphatic hydrocarbons, enhanced with iso-octane or the aromatic hydrocarbons toluene and benzene to increase its octane rating....
. It is defined as the absolute vapor pressure
Vapor pressure

Vapor pressure , is the pressure of a vapor in Thermodynamic equilibrium with its non-vapor Phase s. All liquids and solids have a tendency to evaporate to a gaseous form, and all gases have a tendency to Condensation back into their original form ....
 exerted by a liquid at 100 °F (37.8 °C) as determined by the test method ASTM-D-323. The test method applies to volatile crude oil and volatile nonviscous petroleum liquids, except liquified petroleum gas
Liquified petroleum gas

Liquefied petroleum gas is a mixture of hydrocarbon gases used as a fuel in heating appliances and vehicles, and increasingly replacing chlorofluorocarbons as an aerosol propellant and a refrigerant to reduce damage to the ozone layer....
es.

The Reid vapor pressure (RVP) differs slightly from the True Vapor Pressure
True vapor pressure

True vapor pressure is a common measure of the volatility of petroleum distillate fuels. It is defined as theequilibrium partial pressure exerted by a volatile organic liquid as a function of temperature as determined by the test method ASTM D 2879....
 (TVP) of a liquid due to some small sample vaporization and the presence of water vapor and air in the confined space of the test equipment, i.e. the RVP is the absolute vapor pressure and the TVP is the partial vapor pressure. Conversions between the two can be found (p 7.1-54 and onwards)

See also

  • Gasoline volatility
    Gasoline

    File:GasCan.jpgGasoline or petrol is a petroleum-derived liquid mixture, primarily used as fuel in internal combustion engines.It consists mostly of aliphatic hydrocarbons, enhanced with iso-octane or the aromatic hydrocarbons toluene and benzene to increase its octane rating....
  • True Vapor Pressure
    True vapor pressure

    True vapor pressure is a common measure of the volatility of petroleum distillate fuels. It is defined as theequilibrium partial pressure exerted by a volatile organic liquid as a function of temperature as determined by the test method ASTM D 2879....
  • Vapor pressure
    Vapor pressure

    Vapor pressure , is the pressure of a vapor in Thermodynamic equilibrium with its non-vapor Phase s. All liquids and solids have a tendency to evaporate to a gaseous form, and all gases have a tendency to Condensation back into their original form ....


External links

  • (RVP is a parameter in the estimation of petroleum tank evaporative losses)