{"term":{"id":"01605","doi":"10.1351\/goldbook.D01605","code":"D01605","status":"current","longtitle":"IUPAC Gold Book - depth of penetration of light","title":"depth of penetration","version":"2.3.3","lastupdated":"2014-02-24","definitions":[{"id":"1","text":"The inverse of the absorption coefficient. If the decadic absorption coefficient, a, is used, the depth of penetration (1\/a) is the distance at which the radiant power, P λ, decreases to one tenth of its incident value, P λ 0. If the Naperian absorption coefficient, α, is used, the depth of penetration (1\/α = β in this case) is the distance at which the radiant power decreases to 1\/e of its incident value.","contexts":{"of":["light"]},"links":[{"title":"absorption coefficient","type":"internal","url":"https:\/\/goldbook.iupac.org\/terms\/view\/A00037"},{"title":"radiant power","type":"goldify","url":"https:\/\/goldbook.iupac.org\/terms\/view\/R05046"},{"title":"absorbance","type":"see","url":"https:\/\/goldbook.iupac.org\/terms\/view\/A00028"},{"title":"attenuance","type":"see","url":"https:\/\/goldbook.iupac.org\/terms\/view\/A00513"}],"math":[{"alttext":"a","latex":"a"},{"alttext":"1\/a","latex":"\\frac{1}{a}"},{"alttext":"P λ","latex":"P_{\\lambda }"},{"alttext":"P λ 0","latex":"P_{\\lambda }^{0}"},{"type":"symbol","alttext":"α","latex":"\\alpha "},{"alttext":"1\/α = β","latex":"\\frac{1}{\\alpha } = \\beta "},{"alttext":"1\/e","latex":"\\frac{1}{\\text{e}}"}],"sources":["PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2235 (https:\/\/doi.org\/10.1351\/pac199668122223)"]}],"referencedin":[{"title":"Wikipedia - Mathematical descriptions of opacity (en)","url":"https:\/\/en.wikipedia.org\/wiki\/Mathematical_descriptions_of_opacity"}],"links":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/D01605\/html","json":"https:\/\/goldbook.iupac.org\/terms\/view\/D01605\/json","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/D01605\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/D01605\/plain","pdf":"https:\/\/goldbook.iupac.org\/terms\/view\/D01605\/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). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https:\/\/doi.org\/10.1351\/goldbook.","license":"Licensed under Creative Commons Attribution-NoDerivatives (CC BY-NC-ND) 4.0 International (https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/)","collection_reuse":"For parties interested in reusing the entire IUPAC Gold Book please contact IUPAC here https:\/\/www.cognitoforms.com\/IUPAC1\/ContactInformationForm","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":"2023-05-31T11:25:30+00:00"}}