Barrel | Types, Uses & Unit of Measurement | Britannica
https://www.britannica.com/technology/barrel-container
Feb 5, 2024 · barrel, large, bulging cylindrical container of sturdy construction traditionally made from wooden staves and wooden or metal hoops. The term is also a unit of volume measure, specifically 31 gallons of a fermented or distilled beverage, or 42 gallons of a petroleum product.
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