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<\/div> The value of 5.545 stands for <\/span>. These expressions assume a Gaussian (symmetrical) peak. In these expressions the units for the quantities inside the brackets must be consistent so that their ratio is dimensionless: i.e. if the numerator is a volume, then peak width must also be expressed in terms of volume. In former nomenclature the expressions 'number of theoretical plates<\/span>' or 'theoretical plate number<\/span>' were used for the same term. For simplification, the present name is suggested.","text":"A number indicative of column performance, calculated from the following equations which depend on the selection of the peak width expression: [math: N = ( V R σ ) 2 = ( t R σ ) 2]. These expressions assume a Gaussian (symmetrical) peak. In these expressions the units for the quantities inside the brackets must be consistent so that their ratio is dimensionless: i.e. if the numerator is a volume, then peak width must also be expressed in terms of volume. In former nomenclature the expressions 'number of theoretical plates' or 'theoretical plate number' were used for the same term. For simplification, the present name is suggested.","contexts":{"in":[],"of":[]},"chemicals":[],"links":[],"math":[{"meaning":null,"type":null,"latex":"N=(\\frac{V_{\\text{R}}}{\\sigma })^{2}=(\\frac{t_{\\text{R}}}{\\sigma })^{2}"},{"meaning":null,"type":null,"latex":"N=16\\ (\\frac{V_{\\text{R}}}{w_{\\text{b}}})^{2}=16\\ (\\frac{t_{\\text{R}}}{w_{\\text{b}}})^{2}"},{"meaning":null,"type":null,"latex":"N=5.545\\ (\\frac{V_{\\text{R}}}{w_{\\text{h}}})^{2}=5.545\\ (\\frac{t_{\\text{R}}}{w_{\\text{h}}})^{2}"},{"meaning":null,"type":null,"latex":"8\\ \\ln 2"}],"sources":["PAC, 1993, 65, 819. 'Nomenclature for chromatography (IUPAC Recommendations 1993)' on page 847 (https:\/\/doi.org\/10.1351\/pac199365040819)"]}]},"referencedin":[{"title":0,"url":"https:\/\/en.wikipedia.org\/wiki\/Van_Deemter_equation","source":"wikipedia"}],"links":{"html":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/P04694\/html","json":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/P04694\/json","xml":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/P04694\/xml","plain":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/P04694\/plain","pdf":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/P04694\/pdf","originalpdf":"http:\/\/iupac.org\/goldbook\/P04694.pdf"},"citeas":"IUPAC. Compendium of Chemical Terminology, 2nd ed. (the \"Gold Book\"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http:\/\/goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https:\/\/doi.org\/10.1351\/goldbook.","license":"Licensed under Creative Commons Attribution-NoDerivatives (CC-BY-ND) 4.0 International (https:\/\/creativecommons.org\/licenses\/by-nd\/4.0\/)","disclaimer":"The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.","accessed":"2019-03-23T03:31:36-05:00"}}