Barrel (unit)

A barrel is one of several units of volume, with dry barrels, fluid barrels (UK beer barrel, US beer barrel), oil barrel, etc. The volume of some barrel units is double others, with various volumes in the range of about 100–200 litres ( ;  ), due to historical reasons. Since medieval times the measure barrel has been used with different meanings around Europe, from about 100 litres to above 1000 in special cases. The name comes from medieval French baril.

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