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A '''barrel''' is a unit of [[volume]] whose size depends on the liquid measured. The most common use is in regard to [[oil]], where prices and quantities are usually referred to by the barrel. In this context, the barrel equals 42 U.S. [[gallon]]s of liquid.<ref>U.S. Department of Transportation Maritime Administration [http://www.marad.dot.gov/publications/glossary/glossary.html]</ref>

A '''barrel''' is a unit of [[volume]] whose size depends on the liquid measured. The most common use is in regard to [[oil]], where prices and quantities are usually referred to by the barrel. In this context, the barrel equals 42 U.S. [[gallon]]s of liquid.<ref>[http://www.marad.dot.gov/publications/glossary/glossary.html U.S. Department of Transportation Maritime Administration]</ref>

Beer and wine are sometimes also mentioned in barrels. In those contexts, the volume of a barrel may vary between 31 and 36 gallons.

Beer and wine are sometimes also mentioned in barrels. In those contexts, the volume of a barrel may vary between 31 and 36 gallons.

==See Also==

==See also==

* [[55 gallon drum]]

* [[55 gallon drum]]

* [[Crude oil]]

* [[Crude oil]]