( See also: Standard temperature and pressure#Molar volume of a gas.) A standard barrel in this context is thus not simply a measure of volume, but of volume under specific conditions. This standard barrel of oil will occupy a different volume at different pressures and temperatures. Īccording to the American Petroleum Institute (API), a standard barrel of oil is athe amount of oil that would occupy a volume of exactly 1 barrel (159 L) at reference temperature and pressure conditions of 60 ☏ (15.6 ☌) and 14.696 psi (101.325 kPa). In the oil industry, one barrel ( unit symbol bbl) is a unit of volume used for measuring oil defined as 42 US gallons or 158.987 litres or 35 imperial gallons. gallons, actual barrels used in industry are typically 55 U.S. While the barrel as a unit of measurement for oil is 42 U.S. When referring to beer barrels or kegs in many countries, the term may be used for the commercial package units independent of actual volume, where common range for professional use is 20–60 L, typically a DIN or Euro keg of 50 L. The size of beer kegs in the US is based loosely on fractions of the US beer barrel. In the US most fluid barrels (apart from oil) are 31.5 US gallons (26 imp gal 119 L) (half a hogshead), but a beer barrel is 31 US gallons (26 imp gal 117 L). In the UK a beer barrel is 36 imperial gallons (43 US gal 164 L).
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