Barrel
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A barrel or cask is a hollow cylindrical container with a bulging center, longer than it is wide. They are traditionally made of wooden staves and bound by wooden or metal hoops. The word vat is often
Traditional oak barrels made by Chilean cooperage Tonelería Nacional
Mackmyra barrels at Häckeberga Castle
Modern stainless steel casks and kegs outside the Castle Rock microbrewery in Nottingham, England
Wooden wine barrel at an exhibition in Croatia
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
Barrel
…the 19th century these were gradually replaced by metal hoops that were stronger, more durable and took up less space. Barrel has also been used as a standard size of measure, referring to a set capacity or weight of a given commodity. For example, in the UK and Ireland, a barrel of beer refers to a quantity of 36 imperial…
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.