International Union of Pure and Applied Chemistry
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[[Image:IUPAC.svg|thumb|150px|IUPAC logo]]
The '''International Union of Pure and Applied Chemistry''' ('''IUPAC''') ({{IPAEng|aɪjuːpæk}} <small>or</small> ''ay-yoo-pec'') is an international [[non-governmental organization]] established in [[1919]] devoted to the advancement of [[chemistry]]. It has as its members national chemistry societies. It is most well known as the recognized authority in developing standards for the naming of the chemical elements and their compounds, through its Interdivisional Committee on Nomenclature and Symbols ([[International Union of Pure and Applied Chemistry nomenclature|IUPAC nomenclature]]). It is a member of the [[International Council for Science]] (ICSU).
In addition to nomenclature guidelines, the IUPAC sets standards for international spelling in the event of a dispute; for example, it ruled that international [[aluminium]] is preferable to the [[American English|American]] ''aluminum'' and American [[sulfur]] is preferable to the [[British English|British]] ''sulphur''.
Many IUPAC publications are available over the [[Internet]]. For example, [[Quantities, Units and Symbols in Physical Chemistry]] (the "Green Book") can be downloaded in its entirety, while [[Compendium of Chemical Terminology]] is fully searchable online.
An important IUPAC supplement ("Recommendations for nomenclature and tables in biochemical thermodynamics, 1994") is available at http://www.chem.qmul.ac.uk/iubmb/thermod/.
As the introduction to the proposed 3rd edition points out, the failure to use standardized units can result in disastrous consequences, illustrated by the loss of NASA's [[Mars Climate Orbiter]].
==See also==
* [[Element naming controversy]]
* [[International Chemical Identifier]] (InChI)
* [[Institute for Reference Materials and Measurements]] (IRMM)
* [[National Institute of Standards and Technology]] (NIST)
* [[International Union of Pure and Applied Chemistry nomenclature]]
* [[European Association for Chemical and Molecular Sciences]]
==External links==
*[http://www.iupac.org/ Official website]
[[Category:Chemistry societies]]
[[Category:Standards organizations]]
[[Category:Chemical nomenclature]]
[[Category:1919 establishments]]
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[[ca:Unió Internacional de Química Pura i Aplicada]]
[[cs:Mezinárodní unie pro čistou a užitou chemii]]
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[[es:Unión Internacional de Química Pura y Aplicada]]
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[[fr:Union internationale de chimie pure et appliquée]]
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[[sk:Medzinárodná únia čistej a aplikovanej chémie]]
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