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In the United States, a gallon is a unit of volume measurement commonly used to measure liquids. It is abbreviated as "gal." In the US customary system, one liquid gallon is equal to 128 fluid ounces or approximately 3.78541 liters. Gallons are commonly used to measure larger volumes of liquids such as gasoline, milk, water, and other beverages.

In the United Kingdom, a gallon is a unit of volume measurement used to measure liquids. It is abbreviated as "gal" or "imperial gal." In the UK, one gallon is equal to 4.54609 liters. Gallons in the UK are commonly used to measure larger volumes of liquids such as fuel, beer, and milk. They are also used in industries such as agriculture, transportation, and manufacturing.