Information about Fluid Ounce
A fluid ounce is a unit of volume in both the Imperial system of units and the U.S. customary units system.
Definition
The two types of ounces have slightly different definitions:- The Imperial fluid ounce is 1/160 of an imperial gallon or 1/20 of an imperial pint or 8 fluid drams, about 1.734 cubic inches or 28.41 millilitres.[1] This volume of water weighs very nearly 1 avoirdupois ounce (it is the volume occupied by one ounce at 62 °F (16.7 °C), weighed in air with brass weights).
- The U.S. fluid ounce is defined to be 1/128 of a U.S. gallon or 1/16 of a U.S. pint, about 1.804 cubic inches or 29.57 millilitres. This volume of cool, pure water weighs about 1.04 avoirdupois ounces (29.5 g). (U.S. regulation 21 CFR 101.9(b)(5)(viii) also defines a fluid ounce as exactly 30 ml, but this is for use in nutrition labeling only.[2] )
- These two definitions, one using imperial units and one metric, are not meant to concur exactly and are a common source of confusion.
Etymology
The word ounce derives originally from a word meaning "one" (originally "one" twelfth part of a troy pound)[3]. The word unit is also derived from the same original word, unus (one). [1] [2] In effect, the phrase "fluid ounce" is essentially equivalent to "liquid unit".References
1. ^ The Units of Measurement Regulations 1995 (2000-09-20). Retrieved on 2006-04-18.
2. ^ Food and Drug Administration, HHS (PDF). Retrieved on 2006-04-18.
3. ^ Definition of ounce, from the Merriam-Webster online.
2. ^ Food and Drug Administration, HHS (PDF). Retrieved on 2006-04-18.
3. ^ Definition of ounce, from the Merriam-Webster online.
See also
- Conversion of units#Volume
The volume of a solid object is the three-dimensional concept of how much space it occupies, often quantified numerically. One-dimensional figures (such as lines) and two-dimensional shapes (such as squares) are assigned zero volume in the three-dimensional space.
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Imperial units or the Imperial system is a collection of units, first defined in the British Weights and Measures Act of 1824, later refined (until 1959) and reduced.
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U.S. customary units, also known in the United States as English units[1] (but see English unit) or standard units, are units of measurement that are currently used in the USA, in some cases alongside units from SI (the International System of Units
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There are three definitions in current use:
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- U.S. liquid gallon is legally defined as 231 cubic inches, and is equal to 3.785411784 litres (exactly) or about 0.13368 cubic foot. This is the most common definition of a gallon in the USA. The U.S.
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The pint is an English unit of volume or capacity in the imperial system and United States customary units, equivalent in each system to one half of a quart, and one eighth of a gallon.
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dram (archaic spelling drachm) is historically both a coin and a weight. Currently it is both a small mass in the Apothecaries' system of weights and a small unit of volume. This unit is called more correctly fluid dram or in contraction also fluidram.
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A cubic inch (plural: cubic inches) is a non-SI unit of volume, equal to the volume of a cube with sides of one inch.
Cubic inches are still sometimes used as a unit of measurement (in engineering contexts, not household contexts) in the United States and United
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Cubic inches are still sometimes used as a unit of measurement (in engineering contexts, not household contexts) in the United States and United
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The litre or liter (see spelling differences) is a unit of volume. There are two official symbols, namely the Latin letter L both in lower and upper case: l and L.
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Water is a common chemical substance that is essential to all known forms of life.[1] In typical usage, water refers only to its liquid form or state, but the substance also has a solid state, ice, and a gaseous state, water vapor.
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The avoirdupois (IPA: /ˌævərdəˈpɔɪz/; French IPA: [avwɑrdypwɑ]
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ounce (abbreviation: oz) is the name of a unit of mass in a number of different systems, including various systems of mass that form part of English units, Imperial units, and United States customary units. Its size can vary from system to system.
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Troy weight is a system of units of mass customarily used for precious metals, black powder, and gemstones.
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Units
The Troy
Although the troy was known to exist in medieval times, it was not until 1758 that it was established as the standard unit from which other..... Click the link for more information.
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