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The US liquid gallon (frequently called simply "gallon") is legally defined as 231 cubic inches, which is exactly 3.785411784 litres. [ 7 ] [ 8 ] A US liquid gallon can contain about 3.785 kilograms or 8.34 pounds of water at 3.98 °C (39.16 °F), and is about 16.7% less than the imperial gallon.
In 1824, these units were replaced with a single system based on the imperial gallon. [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 (277.4 cu in), the imperial gallon is close in size to the old ale gallon.
Once the price of petrol rose above £1 per gallon, the industry requested that they be permitted to sell fuel by the litre rather than the gallon, enabling them to reduce the unit price by a factor of about 4.5 and so to extend the lives of existing pumps. [31]: paras. 2.14-2.15
The US fluid ounce is based on the US gallon, which in turn is based on the wine gallon of 231 cubic inches that was used in the United Kingdom prior to 1824. With the adoption of the international inch , the US fluid ounce became 1 ⁄ 128 gal × 231 in 3 /gal × (2.54 cm/in) 3 = 29.5735295625 mL exactly, or about 4% larger than the imperial unit.
This volume of natural gas has the same energy content as one US gallon of gasoline (based on lower heating values: 900 BTU/cu ft (9.3 kWh/m 3) of natural gas and 114,000 BTU/US gal (8.8 kWh/L) for gasoline). [22] One GGE of CNG pressurized at 2,400 psi (17 MPa) is 0.77 cubic feet (22 litres; 5.8 US gallons).
[nb 1] (This was the basis for calling 64 gallons a quarter.) At some time before the 15th century, it was reduced to 252 gallons, so as to be evenly divisible by other small integers, including seven. [nb 2] Note that a 252-gallon tun of wine has a mass of approximately 2060 pounds, [6] between a short ton (2000 pounds) and a long ton (2240 ...
Note that the second article says imperial gallons for the gasoline/diesel rations even as it converts the 65-liter figure to US gallons (65 liters is 14.3 imperial gallons, 17.2 US gallons) - and the prices (in local currency) as shown are very round numbers, unexpected if it were a conversion to a different unit size.
A US fluid ounce is 1 / 16 of a US pint (about 1·04 UK fluid ounces or 29.6 mL); a UK fluid ounce is 1 / 20 of a UK pint (about 0·96 US fluid ounce or 28.4 mL). On a larger scale, perhaps for institutional cookery, a UK gallon is 8 UK pints (160 UK fluid ounces; about 1·2 US gallons or 4.546 litres), whereas the US gallon is ...