液量オンス
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定義
液体体積の単位で、US液量オンスは29.5735 mL、英国（帝国）液量オンスは28.4131 mLに等しい。
解説
Despite sharing a name, US and UK fluid ounces differ by about 4%, which matters in precise recipes and pharmaceutical dosing. A standard US can of soda is 12 fl oz (355 mL). The fluid ounce is distinct from the mass ounce (28.35 g); for water they are close but not equal, and for denser liquids the difference is significant.
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