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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 U.K. beer barrel and U.S. beer barrel), oil barrels, and so forth. For historical reasons the volumes of some barrel units are roughly double the volumes of others; volumes in common use range approximately from 100 to 200 ...
A barrel is one of several units of volume, with dry barrels, fluid barrels (UK beer barrel, US beer barrel), oil barrel, etc. The volume of some barrel units is double others, with various volumes in the range of about 100–200 litres (22–44 imp gal; 26–53 US gal).
Many drums nominally measure just under 880 millimetres (35 in) tall with a diameter just under 610 millimetres (24 in), and have a common nominal volume of 208 litres (55 US gal) whereas the barrel volume of crude oil is 42 US gallons (159 L). In the United States, 25-US-gallon (95-litre) drums are also in common use and have the same height.
As with the hogshead, the ale barrel underwent various redefinitions. Initially 32 ale or beer gallons (147.9 L), it was redefined in 1688 as 34 ale or beer gallons (157.1 L), and again in 1803 as 36 ale or beer gallons (166.4 L). barrel (Beer) The beer barrel was defined as 36 ale or beer gallons until the adoption of the imperial system.
A unit of volume is a unit of measurement for measuring volume or capacity, ... 1 barrel = 0.158 987 294 928 = 158.987294928 = 42 US gallons = 9,702 cubic inches:
A hogshead in relation to other barrels. A hogshead (abbreviated "hhd", plural "hhds") is a large cask of liquid (or, less often, of a food commodity). It refers to a specified volume, measured in either imperial or US customary measures, primarily applied to alcoholic beverages, such as wine, ale, or cider.
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Due to the risk of confusion with the SI convention where the "M" prefix stands for "mega" representing million, the Society of Petroleum Engineers recommends in their style guide that abbreviations or prefixes M or MM are not used for barrels of oil or barrel of oil equivalent, but rather that thousands, millions or billions are spelled out. [1]