After the adoption of the international inch in 1959, the US fluid ounce became equal to exactly 29.5735295625 mL.Ĭurrent use: As the name indicates, the fluid ounce is typically used as a measurement of liquid volume. The United States fluid ounce was initially based on the wine gallon used in England prior to 1824. The imperial gallon's definition was later changed to be equal to 4.54609 liters, making the imperial fluid ounce equal to exactly 28.4130625 mL. In 1824, the imperial gallon was defined as the volume of ten pounds of water at a temperature of 16.7☌. History/origin: The fluid ounce was originally based on the volume occupied by one ounce (weight) of a given liquid such as wine or water, thus varying based on the system being used. The imperial fluid ounce is 1/20 of an imperial pint, and 1/160 of an imperial gallon, which is equal to 28.4 mL. The US fluid ounce is 1/16 of a US fluid pint, and 1/128 of a US liquid gallon, which is equal to 29.57 mL. Fluid ounceĭefinition: A fluid ounce (symbol: fl oz) is a unit of volume in the imperial and United States customary systems of measurement. Standardized measuring cups are used instead. Actual drinking cups can vary significantly in terms of size and are generally not a good representation of this unit. customary teaspoons.Ĭurrent use: The cup is typically used in cooking to measure liquids and bulk foods, often within the context of serving sizes. One United States customary cup is equal to 236.5882365 milliliters as well as 1/16 U.S. cup is a unit of volume equal to 1/16th of a U.S. It is not the same as an ounce of weight or an Imperial fluid ounce. The metric cup is defined as 250 milliliters. What is 64 ounces in cups 64 fl oz to cups conversion. Definition: A cup is a unit of volume in the imperial and United States customary systems of measurement.
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