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Pound, unit of measure |
| The pound (abbreviations: lb or, sometimes in the United States, #) is a unit of mass in a number of different systems, including various systems of units of mass that formed part of English units, Imperial units, and United States customary units. Its size can vary from system to system. The most commonly used pound today is the international avoirdupois pound. The international avoirdupois pound is equal to exactly 453.59237 grams. The word "pound" comes from the Latin word pendere, meaning "to weigh". In the United States, the (avoirdupois) pound as a unit of mass has been officially defined in terms of the kilogram since 1893. In 1893, the relationship was specified to be 2.20462 pounds were equal to 1 kilogram. In 1894, the relationship was specified to be 2.20462234 pounds were equal to 1 kilogram. This change followed a determination of the British pound. The current international pound differs from the United States 1894 pound by approximately one part in 10 million. |
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