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The 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. The most commonly used ounces used today are the international avoirdupois ounce and the international troy ounce. The pound-force is a non-SI unit of force or weight (properly abbreviated lbf or lbf). The pound-force is equal to a mass of one pound multiplied by the standard acceleration due to gravity on Earth (which is defined as exactly 9. ... An ounce can be: ounce, the name of a number of units of mass; the ounce-force, a unit of force, 1â„16 of the pound-force; a fluid ounce, the name of a number of units of volume; ounce, the name of a unit of length used to measure... The former Weights and Measures office in Middlesex, England. ... For other uses, see Mass (disambiguation). ... English unit is the American name for a unit in one of a number of systems of units of measurement, some obsolete, and some still in use. ... This article is about post-1824 imperial units, see also English unit, U.S. customary units or Avoirdupois. ... 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 â€” the modern metric system). ... The avoirdupois (IPA: ; French IPA: ) system is a system of weights (or, properly, mass) based on a pound of sixteen ounces. ...

The abbreviation "oz" comes from the old Italian word "onza" (now spelled oncia), meaning ounce.

The distinction between mass and weight (or force), and its development, is discussed in the article mass versus weight. In the physical sciences, mass and weight are different properties. ...

## Summary of ounce units GA_googleFillSlot("encyclopedia_square");

Following table shows different ounce units in grams (SI):

Summary of ounce units
Ounce variant Mass in grams
International avoirdupois ounce (most common) 28.349 523 g
International troy ounce 31.103 476 g
Apothecaries' ounce Same as international troy ounce
Maria Theresa ounce 28.066 8 g
Dutch metric ounce 100 g
Chinese metric ounce 50 g

## International avoirdupois ounce

Main article: avoirdupois

An avoirdupois ounce is equal to 437.5 grains. There are 16 avoirdupois ounces in an avoirdupois pound. In 1958 the United States and countries of the Commonwealth of Nations defined the mass of the international avoirdupois pound to be 0.453 592 37 kilograms. Consequently, since 1958, the international ounce is defined to be equal to about 28.349 523 grams. The avoirdupois (IPA: ; French IPA: ) system is a system of weights (or, properly, mass) based on a pound of sixteen ounces. ... A grain is a unit of mass equal to 0. ... The pound or pound-mass (abbreviations: lb, , lbm, or sometimes in the United States: #) is a unit of mass (sometimes called weight in everyday parlance) in a number of different systems, including the imperial and US and older English systems. ... Jan. ... The Commonwealth of Nations as of 2007 Headquarters Marlborough House, London, UK Official languages English Membership 53 sovereign states Leaders  -  Queen Elizabeth II  -  Secretary-General Kamalesh Sharma Appointed 24 November 2007 Establishment  -  Balfour Declaration 18 November 1926   -  Statute of Westminster 11 December 1931   -  London Declaration 28 April 1949  Area  -  Total... Kg redirects here. ... Jan. ... BIC pen cap, about 1 gram. ...

The ounce is commonly used as a unit of mass in the United States. While imperial units have been officially abolished in the United Kingdom, the ounce remains a familiar unit, especially amongst older people.

## International troy ounce

Main article: Troy weight

A troy ounce (abbreviation: t oz) is equal to 480 grains. There are 12 troy ounces in a troy pound. Consequently, the international troy ounce is equal to about 31.103 476 grams. Troy weight is a system of units of mass customarily used for precious metals, black powder, and gemstones. ... A grain is a unit of mass equal to 0. ... The pound or pound-mass (abbreviations: lb, , lbm, or sometimes in the United States: #) is a unit of mass (sometimes called weight in everyday parlance) in a number of different systems, including the imperial and US and older English systems. ... BIC pen cap, about 1 gram. ...

Today, the troy ounce is used only to express the mass of precious metals such as gold, platinum or silver. GOLD refers to one of the following: GOLD (IEEE) is an IEEE program designed to garner more student members at the university level (Graduates of the Last Decade). ... General Name, Symbol, Number platinum, Pt, 78 Chemical series transition metals Group, Period, Block 10, 6, d Appearance grayish white Standard atomic weight 195. ... This article is about the chemical element. ...

For historical measurement of gold, GOLD refers to one of the following: GOLD (IEEE) is an IEEE program designed to garner more student members at the university level (Graduates of the Last Decade). ...

• a fine ounce is a troy ounce of 99.5% (".995") pure gold
• a standard ounce is a troy ounce of 22 carat gold, 91.66% pure (11 "fine ounces" plus one ounce of alloy material)

Carat is a measure of the purity of gold and platinum alloys. ... An alloy is a homogeneous hybrid of two or more elements, at least one of which is a metal, and where the resulting material has metallic properties. ...

## Other ounces

Historically, in different parts of the world, at different points in time, and for different applications, the ounce (or its translation) has referred to broadly similar but different standards of mass (or weight, before the distinction between weight and mass developed). Some of these other ounces are described below.

### Apothecaries' ounce

An apothecaries' ounce defined by the now-obsolete apothecaries' system of mass. This ounce was the same size as the troy ounce, and its symbol was (U+2125). The apothecaries system of mass is an obsolete system formerly used by apothecaries (now called pharmacists or chemists) in English-speaking countries. ... The apothecaries system of mass is an obsolete system formerly used by apothecaries (now called pharmacists or chemists) in English-speaking countries. ... The Unicode Standard, Version 5. ...

### Maria Theresa ounce

"Maria Theresa ounce" was once introduced in Ethiopia and some European countries, which was equal to the weight of one Maria Theresa thaler, or 28.0668 g. Both the weight and the value are the definition of one "Birr", still in use in present-day Ethiopia and formerly in Eritrea. â€¹ The template below (Expand) is being considered for deletion. ...

### Metric ounces

Main article: kilogram

Some countries have redefined their ounces to fit in with the metric system. Kg redirects here. ... The International System of Units (symbol: SI) (for the French phrase Syst me International dUnit s) is the most widely used system of units. ...

The Dutch have redefined their ounce (in Dutch, ons) as 100 grams. Also the Avoirdupois pound (in Dutch pond) was redefined to 500 grams. This was adopted along with the introduction of the metric system and remains in informal usage (mostly in cookery and groceries). BIC pen cap, about 1 gram. ... The avoirdupois (IPA: ; French IPA: ) system is a system of weights (or, properly, mass) based on a pound of sixteen ounces. ...

East Asia has a traditional ounce, known as a tael, of varying value. In China, it has been given a metric value of 50 grams. East Asia Geographic East Asia. ... The tael (&#20841;), PY: Liang, was part of the Chinese system of weights and currency. ...

## References

fluid ounce A fluid ounce is a unit of volume in both the Imperial system of units and the U.S. customary units system. ...

Results from FactBites:

 Units: O (2960 words) The troy ounce is sometimes abbreviated oz t or toz to distinguish it from the more common avoirdupois ounce; in traditional pharmacy it was abbreviated oz ap. One ounce mole of a chemical compound is the same number of ounces as the molecular weight of a molecule of that compound measured in atomic mass units. Thus the ounce mole is equal to 28.349 52 moles.
 Ounce - Wikipedia, the free encyclopedia (403 words) Ounce is also another name for the snow leopard. The ounce is the name for a number of different units of mass (oz), and also of two units of fluid volume (fl oz) and of one unit of force, the ounce-force (ozf). Hides/leathers thickness is measured by a guage in ounces or millimeters.
More results at FactBites »

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