What is GALLON?

A standard unit of volumetric measurement, having in the United States a capacity of 231 cu. in., and equivalent to a weight of 58,328.8 grains of distilled water at maximum density. In Great Britain its capacity is 277.27 cu. in. G., Miniature, in water-testing, a name given to 70 c.c.

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Definition of  GALLON