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GALLON, measures. A gallon is a liquid measure, containing two hundred and thirty-one cubic inches, or four quarts.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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If directions call for one ppm (part per million), then you can measure out 1.3 liquid gallons to be evenly applied to the pond.
In 2008 Brazil produced 24.5 billion liters (6.47 billion US liquid gallons), which represents 37.3% of the world's total ethanol used as fuel.