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The US fluid gallon is exactly 15121 / 107521 smaller than the US dry gallon, while the imperial gallon is about 3.21% larger than the US dry gallon. The dry gallon's implicit value in the US system was originally one-eighth of the Winchester bushel, which was a cylindrical measure of 18.5 inches (469.9 mm) in diameter and 8 inches (203 ...
In the United States, the 42 US-gallon size as a unit of measure is largely confined to the oil industry, while different sizes of barrel are used in other industries. Nearly all other countries use the metric system. Thus, the 42 US-gallon oil barrel is a unit of measure rather than a physical container used to transport crude oil.
In the US, the dry quart and dry pint are exactly 15121 / 92400 larger than their liquid counterparts, while the dry barrel is exactly 1 / 33 smaller than the fluid barrel, except for barrels of beer (dry barrels are exactly 5 / 341 smaller) and barrels of oil (dry barrels are exactly 3 / 11 smaller).
Volume may be measured either in terms of units of cubic length or with specific volume units. The units of cubic length (the cubic inch, cubic foot, cubic mile, etc.) are the same in the imperial and US customary systems, but they differ in their specific units of volume (the bushel, gallon, fluid ounce, etc.).
Blue 55-US gallon (44 imp gal, 200 L) barrel (drum) Wooden casks of various sizes were used to store whale oil on ships in the age of sail. Its viscous nature made sperm whale oil a particularly difficult substance to contain in staved containers. Oil coopers were probably the most skilled coopers in pre-industrial cooperage.
Ships in that size range can carry between 2.5 million and 3.5 million gallons of fuel. The amount of fuel actually be used on a sailing depends primarily on the ship's speed.
Metric regions commonly use the tonne of oil equivalent (toe), or more often million toe (Mtoe). Since this is a measurement of mass, any conversion to barrels of oil equivalent depends on the density of the oil in question, as well as the energy content. Typically 1 tonne of oil has a volume of 1.08 to 1.19 cubic metres (6.8 to 7.5 bbl).
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