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The gallon is a unit of volume in 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 and some Caribbean countries;
the US gallon (US gal) defined as 231 cubic inches (exactly 3.785411784 L), which is used in the US and some Latin American and Caribbean countries; and
the US dry gallon ("usdrygal"), defined as 1⁄8 US bushel (exactly 4.40488377086 L).There are four quarts in a gallon and eight pints in a gallon, which have different volumes in different systems.
The IEEE standard symbol for both US (liquid) and imperial gallon is gal, not to be confused with the gal (symbol: Gal), a CGS unit of acceleration.

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