オンス
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定義
二重用途のヤード・ポンド法単位。質量単位（常衡）として1 oz = 28.3495 g（1/16 lb）、体積単位として1 US液量オンス = 29.5735 mL。
解説
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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