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A standard barrel stores 42 gallons of oil. The volume of the barrel is considered to be equal to 42 gallons of liquid.

\(1\,\,{\rm{oil}}\,{\rm{barrel}}\,\, = \,\,42\,\,{\rm{gallons}}\,\, = \,\,159\,\,{\rm{liters}}\)

The volume of one oil barrel is approximately 158.98 Liters. According to the American Petroleum Institute, a standard barrel contains 159 Liters of oil at a pressure of 101.325 kPa and a temperature of 15.60C.

The US gallon (US gal), defined as 3.785411784 L, (231 cubic inches) which is used in the US and some Latin American and Caribbean countries; and. the US dry gallon ("usd rygal"), defined as 1鈦�8 US bushel (exactly 4.40488377086 L).

One imperial gallon is equivalent to approximately 1.2 U.S. liquid gallons.

Hence,

42 脳1.2 =50.4U.S. gallon

The gallon defined as 3.785 L,

Hence,

42脳3.7854 =158.9868 L

Approximately 159 Liters