GBC
Volume

Gallon (gal)

Modern equivalent

4.54609 litres

The definitive imperial fluid measure standard equal to 4 quarts, still used for UK fuel efficiency metrics.

The imperial gallon was scientifically defined in 1824 as the volume of 10 pounds of distilled water weighed in air, cementing a precise bridge between weight and liquid volume in British metrology.

Part of a system

The Winchester Bushel

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