Unit of capacity or volume in the United States and the United Kingdom, the definition of which depends on the material being measured. In the United States the dry standard barrel is equivalent to 105 dry qt, or 7056 cu in (116 liters), and a barrel of petroleum is defined as 42 U.S. gallons (159 liters).
A barrel or cask is a hollow cylindrical container, traditionally made of staves (curved wooden members) and bound with iron hoops or rope. The term "barrel" typically refers to ...
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