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The international avoirdupois pound (also pound-mass or simply "pound") is a unit of mass in the Imperial and US customary systems of units equal to 0.45359237 kilograms (1 lb = 0.45359237 kg), the base unit of mass in the International System of Units (SI).
One pound (lb) is also equal to 453.59237 grams (g), or 453,592.37 milligrams (mg) or 453.59237 × 106 micrograms (μg) (SI units of mass), or 16 ounces (oz), or 7,000 grains (gr) or 1.2152777(7) troy pounds (lb t), which are US customary / Imperial units of mass.
The pound definition varies depending on the system of units used, as follows:
- The avoirdupois pound (or simply "pound"), equal to 453.59237 × 10-3 kilograms
- The troy pound, equal to 373.2417216 × 10-3 kilograms
- The metric pound, equal to 500 × 10-3 kilograms
Over time, various pounds have been recorded. Examples of pound units include:
- The tower pound, equal to about 350 × 10-3 kilograms
- The merchant's pound, equal to about 437.5 × 10-3 kilograms
- The London pound, equal to about 466.66 × 10-3 kilograms
- The Roman libra, equal to about 327 × 10-3 kilograms
- The Russian pound (or funt), equal to about 409.52 × 10-3 kilograms
- The Jersey pound, equal to about 490 × 10-3 kilograms
(i) The name "pound" comes from the Latin phrase "libra pondo" which means "a pound weight"
(ii) The abbreviation "lb" for pound comes from the Roman "libra"; the "lbs" abbreviation is also commonly used to indicate the plural unit "pounds"
Also called: pound (plural: pounds, symbol: lb, lbs (informal)), pound-mass (symbol: lbm)