The gallon (abbreviation "gal"), is a measure of volume.

Historically it has had many definitions, but there are three definitions in current use:

  • The imperial gallon (≈ 4.546 L) which since metrication is used colloquially in the United Kingdom and semi-officially within Canada
  • The United States (liquid) gallon (≈ 3.79 L)
  • The lesser used U.S. dry gallon (≈ 4.40 L).

The gallon, be it the imperial or U.S. gallon, is sometimes found in other English-speaking countries. Most European Countries follow the metric system and measure volumes in litres - 1 litre = 1 dm^3.

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