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Gallon
Units of volume / From Wikipedia, the free encyclopedia
For other uses, see Gallon (disambiguation).
The gallon is a unit of volume in British imperial units and United States customary units. Three different versions are in current use:
- the imperial gallon (imp gal), defined as 4.54609 litres, which is or was used in the United Kingdom, Ireland, Canada, Australia, New Zealand, and some Caribbean countries;
- the US gallon (US gal), defined as 231 cubic inches (exactly 3.785411784 L),[1] which is used in the United States and some Latin American and Caribbean countries; and
- the US dry gallon ("usdrygal"), defined as 1⁄8 US bushel (exactly 4.40488377086 L).
Quick Facts General information, Unit of ...
gallon | |
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![]() A one-US-gallon gas can showing "U.S. Gallon" marking (for American use), imperial gallons (for British use), and litres (for Canadian use) | |
General information | |
Unit of | Volume |
Symbol | gal |
Conversions (imperial) | |
1 imp gal in ... | ... is equal to ... |
SI units | 4.54609 L |
US customary units | ≈ 1.200950 US gal |
US customary units | ≈ 277.4194 in3 |
Conversions (US) | |
1 US gal in ... | ... is equal to ... |
SI units | 3.785411784 L |
Imperial units | ≈ 0.8326742 imp gal |
Imperial units | 231 in3 |
US dry gallon | ≈ 0.859367 US dry gal |
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There are two pints in a quart and four quarts in a gallon. Different sizes of pints account for the different sizes of the imperial and US gallons.
The IEEE standard symbol for both US (liquid) and imperial gallon is gal,[2] not to be confused with the gal (symbol: Gal), a CGS unit of acceleration.