Once
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Définition
Une unité impériale à double usage : comme unité de masse (avoirdupois), 1 oz = 28,3495 g (1/16 lb) ; comme unité de volume, 1 once liquide américaine = 29,5735 mL.
Explication
The mass ounce and fluid ounce are separate units that should not be confused. One US fluid ounce is defined to make a pint of water weigh approximately one pound — a practical approximation since water's density is close to 1 g/mL. Gold and silver use the troy ounce (31.1035 g), which is heavier than the avoirdupois ounce. Nutrition labels in the US commonly express serving sizes in ounces.
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RELATED TERMS
Système impérial
Un système de mesure utilisé principalement aux États-Unis, fondé sur les unités anglaises historiques.
Système troy
Un système de poids utilisé pour les métaux précieux et les pierres gemmes.
Avoirdupois
Le système de poids standard basé sur la livre de 16 onces, utilisé pour les marchandises courantes.
Cheval-vapeur
Une unité de puissance. Le cheval-vapeur mécanique est égal à environ 745,7 watts.
BTU (Unité thermique britannique)
La quantité de chaleur nécessaire pour élever la température d'une livre d'eau d'un degré Fahrenheit.