True vapor pressure
Encyclopedia
True vapor pressure 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.
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)
equilibrium partial pressure exerted by a volatile organic liquid as a function of temperature as determined by the test method ASTM D 2879.
The true vapor pressure (TVP) at 100 °F differs slightly from the Reid Vapor Pressure
Reid Vapor Pressure
Reid vapor pressure is a common measure of the volatility of gasoline. It is defined as theabsolute vapor pressure exerted by a liquid at 100 °F as determined by the test method ASTM-D-323...
(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)