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See Weight for detail of mass/weight distinction and conversion. Avoirdupois is a system of mass based on a pound of 16 ounces, while Troy weight is the system of mass where 12 troy ounces equals one troy pound. The symbol g 0 is used to denote standard gravity in order to avoid confusion with the (upright) g symbol for gram.
system unit unit-code symbol or abbrev. notes sample default conversion combination output units SI: square kilometre: km2 km 2: US spelling: square kilometer: 1.0 km 2 (0.39 sq mi) km2 sqmi; square metre: m2 m 2: US spelling: square meter: 1.0 m 2 (11 sq ft) m2 sqft; square centimetre: cm2 cm 2: US spelling: square centimeter: 1.0 cm 2 (0.16 ...
1.0 long cwt (110 lb; 51 kg) short hundredweight: short cwt short cwt 1.0 short cwt (100 lb; 45 kg) long quarter: long qtr long qtr 1.0 long qtr (28 lb; 13 kg) short quarter: short qtr short qtr 1.0 short qtr (25 lb; 11 kg) stone: st st 14 lb used mostly in the British Commonwealth except Canada 1.0 st (14 lb; 6.4 kg) st kg. st kg lb; st lb
In 1866, the U.S. Congress passed a law that allowed, but did not require, the use of the metric system in trade and commerce. Included in the law was a table of conversion factors between the customary (i.e. English-derived) and metric units, among them a definition of the meter in terms of the yard, and the kilogram in terms of the pound.
The avoirdupois units of mass and weight differ for units larger than a pound (lb). The British imperial system uses a stone of 14 lb, a long hundredweight of 112 lb and a long ton of 2,240 lb. The stone is not a measurement of weight used in the US. The US customary system uses the short hundredweight of 100 lb and short ton of 2,000 lb.
The Metric Conversion Act of 1975 is an Act of Congress that was signed into law by U.S. President Gerald Ford on December 23, 1975. [1] It declared the metric system "the preferred system of weights and measures for United States trade and commerce", but permitted the use of United States customary units in all activities.
The technical or gravitational FPS system [6] or British gravitational system is a coherent variant of the FPS system that is most common among engineers in the United States. It takes the pound-force as a fundamental unit of force instead of the pound as a fundamental unit of mass. In this sub-system, the unit of mass is a derived unit known ...
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. Systems of measure either define mass and derive a force unit or define a base force and derive a mass unit [ 1 ] (cf. poundal , a derived unit of force in a mass ...