Barrel (unit)
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A barrel is one of several units of volume applied in various contexts: there are dry barrels; fluid barrels, such as the British beer barrel and American beer barrel; oil barrels, etc. For historical
Ale casks at a brewery in the UK. They are firkins, each holding 9 imperial gallons (41 L), or a quarter of a UK beer barrel.
While the barrel as a unit of measurement for oil is 42 U.S. gallons, actual "drums" used in industry typically contain 55 U.S. gallons or 200 litres internationally.
Drum (container)
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A drum is a cylindrical shipping container used for shipping bulk cargo. Drums can be made of steel, dense paperboard, or plastic, and are generally used for the transportation and storage of liquids
Barrel (unit)
…volumes of others; volumes in common use range approximately from 100 to 200 litres (22 to 44 imp gal; 26 to 53 US gal). In many connections, the term drum is used almost interchangeably with barrel. Since medieval times, the term barrel as a unit of measure has had various meanings throughout Europe…
A typical 200-litre (55 US or 44 imp gal) tight head drum
Low level nuclear waste in open head steel drums.
Drum pumps on drums
Filling oil drum, 1914