It is a system that was based on a physical standardized pound that used a prototype weight. It was updated to its current form in 1959. The avoirdupois system is a system that was commonly used in the 13 th century. History/origin: The pound descended from the Roman libra, and numerous different definitions of the pound were used throughout history prior to the international avoirdupois pound that is widely used today. The avoirdupois pound is equivalent to 16 avoirdupois ounces. The international avoirdupois pound (the common pound used today) is defined as exactly 0.45359237 kilograms. Poundĭefinition: A pound (symbol: lb) is a unit of mass used in the imperial and US customary systems of measurement. Most other countries measure body weight in kilograms, and in some cases, in pounds. In 1350, the stone was standardized to be used for wool at a weight of 14 pounds, and in 1835, the United Kingdom adopted this definition for use in the imperial system.Ĭurrent use: The stone as a unit of mass is used mostly in the United Kingdom for measuring body weight. In England, the stone had multiple definitions throughout history, based on the commodity and on local standards. Standardized stones were historically used for trade in England as well as some countries in northern Europe. History/origin: The name "stone" is derived from the use of stones as weights since antiquity. It is defined as 14 pounds or 6.35029318 kilograms. Definition: A stone (symbol: st) is an English and imperial unit of mass.
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