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The ounce (/ ˈ aʊ n s /) is any of several different units of mass, weight, or volume and is derived almost unchanged from the uncia, an Ancient Roman unit of measurement.. The avoirdupois ounce (exactly 28.349 523 125 g) is 1 ⁄ 16 avoirdupois pound; this is the United States customary and British imperial ounce.
[38] [42] As of February 2021, many British people also still use imperial units in everyday life for body weight (stones and pounds for adults, pounds and ounces for babies). [43] Government documents aimed at the public may give body weight and height in imperial units as well as in metric. [44]
The British Imperial system of weights and measures (also known as Imperial units) was established in 1824, prior to which the troy weight system was a subset of pre-Imperial English units. The troy ounce in modern use is essentially the same as the British Imperial troy ounce (1824–1971), adopted as an official weight standard for United ...
A Roman steelyard weight of one dodrans, i.e. 3 ⁄ 4 libra. The units of weight or mass were mostly based on factors of 12. Several of the unit names were also the names of coins during the Roman Republic and had the same fractional value of a larger base unit: libra for weight and as for coin. Modern estimates of the libra range from 322 to ...
British imperial measures distinguish between weight and volume. Weight is measured in ounces and pounds (avoirdupois) as in the U.S. Volume is measured in imperial gallons, quarts, pints, fluid ounces, fluid drachms, and minims. The imperial gallon was originally defined as 10 pounds (4.5359 kg) of water in 1824, and refined as exactly 4.54609 ...
Thus, while the imperial fluid ounce is 3.924% smaller than the US fluid ounce, the imperial gallon, quart, pint and gill are all 20.095% larger than their US fluid measure counterparts. [e] One avoirdupois ounce of water has an approximate volume of one imperial fluid ounce at 62 °F (16.67 °C) [f]: this convenient fluid ounce to avoirdupois ...
Sixteen US fluid ounces make a US pint (8 pints equals 1 gallon in both customary and imperial systems). During the reform of weights and measures legislation in the United Kingdom in 1824, old gallons were replaced by the new imperial gallon, which was defined to be the volume of 10 pounds of water at 62 °F (17 °C), and was determined ...
The pound or pound-mass is a unit of mass used in both the British imperial and United States customary systems of measurement.Various definitions have been used; the most common today is the international avoirdupois pound, which is legally defined as exactly 0.453 592 37 kilograms, and which is divided into 16 avoirdupois ounces. [1]