the headspace of the D323 test chamber before it is heated to 37.8 degrees Celsius. See also Crude oil assay Gasoline volatility Vapor pressure External links ASTM D323 - 06 Standard Test Method for Vapor Pressure of Petroleum Products (Reid Method) Reid Vapor Pressure Requirements for Ethanol Congressional Research Service USA's Environmental Protection Agency (EPA) publication AP-42, Compilation of Air Pollutant Emissions. Chapter 7 (RVP is a parameter in the estimation of petroleum tank evaporative losses) References Chemical properties Physical chemistry Engineering thermodynamics Natural gas Oil refining Petroleum production