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定義
正確に453.59237 g（16常衡オンス）に等しいヤード・ポンド法の質量の単位。力の単位（重量ポンド）としても使用され、4.44822 Nに等しい。
解説
The pound (lb) abbreviation comes from the Latin 'libra pondo' (a pound by weight). As a force unit, one pound-force is the weight of one pound mass under standard gravity (9.80665 m/s²). The US uses pounds for body weight where most countries use kilograms; 1 kg = 2.20462 lb. The pound sterling currency takes its name from a pound of silver.
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