This in turn comes from Latin uno ('one'), and thus originally meant simply 'unit'. Ounce derives from the Ancient Roman uncia, a unit in the Ancient Roman units of measurement weighing about 27.35 grams or 0.967 of an Avoirdupois ounce, that was one-twelfth ( 1⁄ 12) of the Roman pound ( libra). Historically, a variety of different ounces measuring mass or volume were used in different jurisdictions by different trades and at different times in history. The fluid ounce is a measure of volume.The ounce-force is a measure of force (see below).The term 'ounce' is also used in other contexts: It is primarily used in the United States to measure packaged foods and food portions, postal items, areal density of fabric and paper, boxing gloves, and so on, but it is sometimes also used elsewhere in the Anglosphere.Īlthough the avoirdupois ounce is the mass measure used for most purposes, the ' troy ounce' of exactly 31.1034768 g is used instead for the mass of precious metals such as gold, silver, platinum, palladium, rhodium, etc. The avoirdupois ounce (exactly 28.349523125 g) is 1⁄ 16 avoirdupois pound this is the United States customary and British imperial ounce. The ounce ( / ˈ aʊ n s/) is any of several different units of mass, weight or volume and is derived almost unchanged from the uncia, an Ancient Roman unit of measurement. For other uses, see Ounce (disambiguation).
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