A fluid ounce (abbreviated as fl oz or oz fl) is a unit of volume commonly used to measure liquids. The fluid ounce varies in size depending on the system of measurement used: 1. **US Fluid Ounce**: In the United States, a fluid ounce is defined as approximately 29.57 milliliters (ml). It is often used in cooking and nutrition as well as for beverage measurements.
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A unit of volume; the Imperial and United States measures differ. An Imperial fluid ounce contains 8 fluid drachms.