Gallons

The gallon (abbreviation "gal") is a measure of volume that was used in many parts of Western Europe and is still used in the United States. Historically its value differed depending on locality and commodity. In most localities it has been replaced by the liter, but three variants are in current use: the imperial gallon (≈ 4.546 L) which since metrication is used colloquially in the United Kingdom and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), and the lesser-used US dry gallon (≈ 4.40 L). The gallon, be it the imperial or US gallon, is sometimes found in other English-speaking countries.
Category:Math dictionary