The International Union of Pure and Applied Chemistry (IUPAC) is an international non-governmental organization 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 (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 British aluminium is preferable to the American aluminum and American sulfur is preferable to the British sulphur.

Many IUPAC publications are available over the Internet. For example, the Green Book ("Quantities, Units and Symbols in Physical Chemistry, 2nd edition, 1993") can be downloaded in its entirety from http://www.iupac.org/publications/books/gbook/green_book_2ed.pdf. The 2005 version (a work-in-progress) can also be downloaded.

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

• IUPAC nomenclature
• Chemical element
• Element naming controversy
• Periodic table group
• International Chemical Identifier (InChI)

External links

• Official website
• ACD/ChemSKetch Freeware allowing generation of IUPAC Names (free version is limited to small structures)

Chemistry societies Standards organizations | Chemical nomenclature

الإتحاد الدولي للكيمياء البحتة والتطبيقية | Unaniezh Etrevroadel ar Gimiezh Pur hag Arveret | IUPAC | Unió Internacional de Química Pura i Aplicada | International Union of Pure and Applied Chemistry | IUPAC | International Union of Pure and Applied Chemistry | IUPAC | IUPAK | Union internationale de chimie pure et appliquée | IUPAC | IUPAC | IUPAC | Меѓународна Унија за Чиста и Применета Хемија | IUPAC | 国際純正・応用化学連合 | IUPAC | Międzynarodowa Unia Chemii Czystej i Stosowanej | IUPAC | ИЮПАК | Medzinárodná únia čistej a aplikovanej chémie | Mednarodna zveza za čisto in uporabno kemijo | IUPAC | IUPAC | IUPAC | IUPAC | 國際純粹與應用化學聯合會