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Start from the pound avoirdupois, the usual unit of mass and weight in the English system. SI dominates the world now and the English pound mass is now defined in terms of the kilogram. pound mass = 0.45359237 kg
English units were the units of measurement used in England up to 1826 (when they were replaced by Imperial units), which evolved as a combination of the Anglo-Saxon and Roman systems of units. Various standards have applied to English units at different times, in different places, and for different applications.
The slug is a derived unit of mass in a weight-based system of measures, most notably within the British Imperial measurement system and the United States customary measures system.
The slug is the unit of mass in the US common system of units, where the pound is the unit of force. The pound is therefore the unit of weight since weight is defined as the force of gravity on an object.
British Imperial and U.S. Customary systems of weights and measures. unit. abbreviation or symbol. equivalents in other units of same system. metric equivalent. Weight. Avoirdupois*. avdp. * The U.S. uses avoirdupois units as the common system of measuring weight.
UnitAbbreviation Or SymbolEquivalents In Other Units Of Same ...Metric Equivalentpoundlb, lb avdp, or #16 ounces, or 7,000 grains0.454 kilogramounceoz, or oz avdp16 drams, 437.5 grains, or 0.0625 pound28.350 gramsdramdr, or dr avdp27.344 grains, or 0.0625 ounce1.772 gramsgraingr0.037 dram, or 0.002286 ounce0.0648 gramA similar system, termed British Engineering Units by Halliday and Resnick (1974), is a system that uses the slug as the unit of mass, and in which Newton's law retains the form F = ma. [5] Modern British engineering practice has used SI base units since at least the late 1970s.
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What is the corresponding unit of mass?
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What is a British engineering unit?
The English system use force, mass, length and time as primary quantities. Other units are secondary. The British Imperial System is a FMLT (force-mass-length-time) system. Note that the use of four, three, two or even one (!) primary quantities is a human choice and not necessary basic nature. Imperial Primary Quantities.
