Libra
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Definição
Unidade imperial de massa igual a exatamente 453,59237 gramas (16 onças avoirdupois), também usada como unidade de força (libra-força) igual a 4,44822 newtons.
Explicação
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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RELATED TERMS
Sistema Imperial
Sistema de medição utilizado principalmente nos Estados Unidos, baseado em unidades inglesas históricas.
Peso Troy
Sistema de pesos utilizado para metais preciosos e pedras preciosas.
Avoirdupois
O sistema padrão de pesos baseado na libra de 16 onças, usado para mercadorias cotidianas.
Cavalo-Vapor
Unidade de potência; o cavalo-vapor mecânico equivale a aproximadamente 745,7 watts.
BTU (Unidade Térmica Britânica)
A quantidade de calor necessária para elevar a temperatura de uma libra de água em um grau Fahrenheit.