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Fluid Ounce





  • The U.S. fluid ounce is defined to be 1/128 of a U.S. gallon, exactly 1.8046875 cubic inches or 29.5735295625 milliliters. This volume of cool, pure water weighs about 1.04 avoirdupois ounces (29.5 g).

  • --- U.S. regulation 21CFR101.9(b)(5)(viii) also defines a fluid ounce of exactly 30 mL, for use in nutrition labeling.2



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