IUPAK
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IUPAKodIUPACesas Internaciona Uniono pri Pura ed Aplikada Kemio. Lua nomo esas akronimo di l'Angla esprimoInternational Union of Pure and Applied Chemistry.Ol esas internaciona, ne-registara organizuro fondita en 1919 dedikata al plubonigo di kemio, e donacas ciencala rekonmendi pri multa temi di kemio, exemple terminologio e mezurado. Ol esas membro di ICSU, l'Internaciona Konsilistaro pri Cienco.
Ol ordinare esas l'agnoskata autoritato pri la nomado di kemiala kombinaji, e normigasliterumadokande existas kontroversi. Exemple, komitato di IUPAC decidis ke esas preferinde l'Usanaliterumadosulfurvice laBritanianasulphurpor l'elementosulfo,e ke Britanianaaluminium(aluminio) esas plu konkorda kun altra metali (qui finas per '-ium') kam l'Usanaaluminum.