Imperial units | History, Measurements | English unit
Imperialunits,alsocalledBritishImperialSystem,unitsofmeasurement[1]oftheBritishImperialSystem[2],thetraditionalsystemofweightsandmeasuresusedofficiallyinGreatBritainfrom1824untiltheadoptionofthemetricsystem[3]beginningin1965.TheUnitedStatesCustomarySystem[4]ofweightsandmeasuresisderived[5]fromtheBritishImperialSystem.Imperialunitsarenowlegallydefinedinmetricterms.EarlyoriginsTheBritishImperialSystemevolvedfromthethousandsofRoman,Celtic,Anglo-Saxon,andcustomarylocalunitsemployedintheMiddleAge...
Imperial units, also called British Imperial System, units of measurement[1] of the British Imperial System[2], the traditional system of weights and measures used officially in Great Britain from 1824 until the adoption of the metric system[3] beginning in 1965. The United States Customary System[4] of weights and measures is derived[5] from the British Imperial System. Imperial units are now legally defined in metric terms.
Early originsThe British Imperial System evolved from the thousands of Roman, Celtic, Anglo-Saxon, and customary local units employed in the Middle Ages[6]. Traditional names such as pound[7], foot, and gallon were widely used, but the values so designated varied with time, place, trade, product specifications, and dozens of other requirements. Early royal standards established to enforce uniformity took the name Winchester, after the ancient capital of Britain, where the 10th-century Saxon king Edgar ...