barrel (unit)

See Barrel (disambiguation) for other uses. The barrel is the name of several units of volume:Oil barrel: 42 U.S. gallons, 158.9873 litres, or 34.97231575 Imperial (UK) gallons.UK beer barrel: 36 UK gallons (163.7 litres).US beer barrel: 31½ U.S. gallons (117.3 litres), the result of tax law definitions. US non-beer liquid barrel: 31.5 U.S. gallons (119.2 litres), or half a hogshead.US dry barrel: 105 dry quarts (115.6 litres).
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