How is a gallon abbreviated?

The term "gallon" is commonly abbreviated as "gal." This abbreviation is widely recognized in measurement standards and is used in both the United States customary units and the Imperial system.

Other options represent different units of measurement. "qt" stands for quart, which is a smaller volume unit than a gallon. "mL" indicates milliliters, a much smaller unit of volume used primarily in medical and laboratory settings. "kg" stands for kilograms, which is a unit of mass, not volume. This is why "gal" is the correct abbreviation for a gallon.