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gallon:see English units of measurementEnglish units of measurement,
principal system of weights and measures used in a few nations, the only major industrial one being the United States. It actually consists of two related systems—the U.S.
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A unit of volume used in the United States for measurement of liquid substances, equal to 231 cubic inches, or to 3.785 411 784 × 10-3 cubic meter, or to 3.785 411 784 liters; equal to 128 fluid ounces.
A unit of volume used in the United Kingdom for measurement of liquid and solid substances, usually the former; equal to 4.54609 × 10-3 cubic meter, or to 4.54609 liters; equal to 160 fluid ounces. Also known as imperial gallon.
1. Brit a unit of capacity equal to 277.42 cubic inches. 1 Brit gallon is equivalent to 1.20 US gallons or 4.55 litres
2. US a unit of capacity equal to 231 cubic inches. 1 US gallon is equivalent to 0.83 imperial gallon or 3.79 litres