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reword, add other liquids than oil, tempreature in Fahrenheit not mentioned by the source (and would be nonsensical since the gallon doesn't vary with temperature).
A '''barrel''' is a unit of [[volume]] that 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 common use of the term barrel is in regard to oil, where prices and quantities are usually referred to by the barrel.
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>
Beer and wine are sometimes also mentioned in barrels. In those contexts, the volume of a barrel may vary between 31 and 36 gallons.
==References==
==References==
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[[Category:Shipping Terms]][[Category:Units of Measurement]]
[[Category:Shipping Terms]][[Category:Units of Measurement]]