In 1824, the British Parliament defined the imperial gallon as the volume of ten pounds of water at standard temperature. For example, the 364-pound woolsack (165 kg) had a 14-pound allowance (6.4 kg) for the weight of the sack and other packaging materials. Various ounces were used over the centuries, including the Tower ounce, troy ounce, avoirdupois ounce, and ounces used in international trade, such as Paris troy, a situation further complicated by the medieval practice of "allowances", whereby a unit of measure was not necessarily equal to the sum of its parts. The ounce in question also varied depending on the system of fluid measure, such as that used for wine versus ale. The fluid ounce was originally the volume occupied by one ounce of some substance, for example wine (in England) or water (in Scotland). US customary fluid ounce 1 US fluid ounceįor serving sizes on nutrition labels in the US, regulation 21 CFR §101.9(b) requires the use of "common household measures", and 21 CFR §101.9(b)(5)(viii) defines a "common household" fluid ounce as exactly 30 milliliters. The volume of 1 avoirdupois ounce of water A volume of pure water measuring one imperial fluid ounce has a mass of almost exactly one ounce.ĭefinitions and equivalences Imperial fluid ounce 1 imperial fluid ounce ![]() ![]() The fluid ounce is distinct from the (international avoirdupois) ounce as a unit of weight or mass, although it is sometimes referred to simply as an "ounce" where context makes the meaning clear (e.g., "ounces in a bottle").
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