Reid Vapor Pressure (RVP)

Definition - What does Reid Vapor Pressure (RVP) mean?

Reid Vapor Pressure is the pressure exerted by a liquid to calculate the volatile nature of gasoline. The pressure is exerted at a specific temperature, that is, 100 degrees Fahrenheit. It is determined by a test known as ASTM-D-323. Reid Vapor Pressure is measured in gauge pressure and is stated in psi units. It is important to calculate its value as it relates with the function and operation of gasoline carbureted in vehicles. Reid Vapor Pressure also provides a convenient approximation of the absolute vapor pressure.

Petropedia explains Reid Vapor Pressure (RVP)

Reid Vapor Pressure is mainly used as an indicator to measure the volatile nature of hydrocarbons. The measurement is done by ASTM method and test results are widely used as a criterion for blending gasoline and many other petroleum products. It is slightly different from true vapor pressure as Reid Vapor Pressure is absolute vapor pressure while true vapor pressure is partial vapor pressure. The values of Reid Vapor Pressure can be converted to true vapor pressure by using nomograms: however, the vice versa is not possible.

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