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The gallon is a unit of volume in British imperial units and United States customary units.. The imperial gallon (imp gal) is defined as 4.546 09 litres, and is or was used in the United Kingdom and its former colonies, including Ireland, Canada, Australia, New Zealand, India, South Africa, Malaysia and some Caribbean countries, while the US gallon (US gal) is defined as 231 cubic inches (3. ...
Both the 42-US-gallon (159 L) barrels (based on the old English wine measure), the tierce (159 litres) and the 40-US-gallon (150 L) whiskey barrels were used. Also, 45-US-gallon (170 L) barrels were in common use. The 40 gallon whiskey barrel was the most common size used by early oil producers, since they were readily available at the time.
Troy weight, avoirdupois weight, and apothecaries' weight are all built from the same basic unit, the grain, which is the same in all three systems. However, while each system has some overlap in the names of their units of measure (all have ounces and pounds), the relationship between the grain and these other units within each system varies.
[a] Originally defined as the volume of 10 pounds (4.54 kg) of distilled water (under certain conditions) [b], then redefined by the Weights and Measures Act 1985 to be exactly 4.546 09 L (≈277.42 cu in), the imperial gallon is 1.62% smaller than the pre-1824 ale gallon.
It can be measured by its volume in standard cubic feet (ft 3) at atmospheric conditions, by its weight in pounds ... 1.0000: gallons (US) 114,000 BTU (33.41 kWh)/gal US:
When the Tower system was abolished in the 16th century, the bushel was redefined as 56 avoirdupois pounds. The imperial bushel established by the Weights and Measures Act 1824 described the bushel as the volume of 80 avoirdupois pounds of distilled water in air at 62 °F (17 °C) [citation needed] or 8 imperial gallons. [1]
c. 74) declared that, for measures of liquids and unheaped dry volume, a 'quarter' equals eight bushels (64 imperial gallons (290.95 L), where a gallon is defined as a volume of water weight ten troy pounds). [12] The term pail is also used for this unit of dry volume. [13] The 1824 Act delegitimised all previous definitions.
From the time of Offa King of Mercia (8th century) until 1526 the Saxon pound, also known as the moneyers' pound (and later known as the Tower pound) was the fundamental unit of weight (by Offa's law, one pound of silver, by weight, was subdivided into 240 silver pennies, hence (in money) 240 pence – twenty shillings – was known as one pound).