Fluid ounce
Fluid ounce
A Fluid ounce (pronunciation: /ˈfluːɪd ˈaʊns/) is a unit of volume (also called capacity) typically used for measuring liquids. Various definitions have been used throughout history, but only two are still in common use: the British Imperial and the United States customary fluid ounce.
Etymology
The term "ounce" originates from the Latin uncia, a unit that was one-twelfth of the Roman pound. "Fluid ounce" is derived from this term, with "fluid" indicating it is a measure of volume rather than weight.
British Imperial fluid ounce
A British Imperial fluid ounce is 1/20 of an Imperial pint, or 28.4130625 millilitres. It is used in the UK and other countries that used the British Imperial system before switching to the metric system.
United States customary fluid ounce
A United States customary fluid ounce is 1/16 of a U.S. customary pint, or approximately 29.5735297 millilitres. It is used in the United States and countries that use the U.S. customary system.
Related terms
- Pint: A unit of volume or capacity in both the Imperial and United States customary measurement systems.
- Millilitre: A metric unit of volume that is one thousandth of a litre.
- Litre: A metric unit of volume.
- Volume: The amount of space that a substance or object occupies.
- Capacity: The maximum amount that something can contain, often used interchangeably with volume in the context of measuring liquids.
External links
- Medical encyclopedia article on Fluid ounce
- Wikipedia's article - Fluid ounce
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