volume of 10 pounds of distilled water of density weighed in air of density against weights of density , which works out to . The Weights and Measures Act 1985 defined a gallon to be exactly (approximately ).

British apothecaries' volume measures

These measurements were in use from 1826, when the new imperial gallon was defined. For pharmaceutical purposes, they were replaced by the metric system in the United Kingdom on 1 January 1971. In the US, though no longer recommended,

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