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In contrast, one tonne of crude oil might occupy 6.5 barrels (1,030 litres; 273 US gallons), and one tonne of gasoline will require 7.9 barrels (1,260 litres; 332 US gallons). [20] Overall, the conversion is usually between 6 and 8 barrels (954 and 1,270 litres; 252 and 336 US gallons) per tonne.
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 gallons (160 L; 43 US gal), and is distinguished from other unit measurements, such as firkins, hogsheads, and kilderkins. [7]
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.
The tun (Old English: tunne, Latin: tunellus, Medieval Latin: tunna) is an English unit of liquid volume (not weight), used for measuring wine, [1] oil or honey. Typically a large vat or vessel, most often holding 252 wine gallons, but occasionally other sizes (e.g. 256, 240 and 208 gallons) were also used. [2]
It is one quarter of a barrel and its value depends on the current size of a barrel, but at present: [7] 1 firkin = 0.25 barrel = 9 imperial gallons = 10.8 U.S. gallons = 41 litres. A wine firkin was much larger: 1 wine firkin = 70 imperial gallons. [8]
= 8 imperial gallons = 4 imperial pecks = 36.368 72 litres: ≈ 8.25645 US dry gallons ≈ 9.60760 US fluid gallons ≈ 2 219.36 cubic inches: ≈ 1.284 35 cubic feet 1 US bushel [6] = 8 US dry gallons = 4 US pecks = 2 150.42 cubic inches = 1.244 46 cubic feet = 35.239 070 166 88 litres ≈ 9.3092 US fluid gallons ≈ 7.7515 imperial gallons
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Most U.S. brewers sell beer in 1 ⁄ 2 barrels of 15.5 gallons, 1 ⁄ 4 barrels of 7.75 gallons, and 1 ⁄ 6 barrels of 5.17 gallons. Since keg sizes are not standardized, the keg cannot be used as a standard unit of measure for liquid volumes. Despite this, a number of people still refer to kegs as if they were a unit of measure.