08631 IUPAC Gold Book - Kubelka–Munk function 10.1351/goldbook.08631 08631 current synonym: remission function 1 \(f(R_{\infty}) = (1 – R_{\infty})^{2}/2R_{\infty}\), where \(R_{\infty}\) is the diffuse reflectance from a sample of infinite depth. Theoretically \(f(R_{\infty})\) equals the ratio of the linear decadic absorption coefficient to the scattering coefficient. Under the assumptions of the Kubelka Munk theory, if the scattering coefficient at a given wavenumber is a constant for a given set of samples, \(f(R_{\infty})\) is directly proportional to the product of the absorption coefficient and concentration of each component of a mixture, analogous to the behaviour of absorbance under Beer’s law. diffuse reflectance https://goldbook.iupac.org//terms/view/08235 scattering coefficient https://goldbook.iupac.org//terms/view/16251 volume reflection https://goldbook.iupac.org//terms/view/08710 wavenumber https://goldbook.iupac.org//terms/view/08302 PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 753 (https://doi.org/10.1515/pac-2019-0203) https://goldbook.iupac.org/terms/view/08631/html https://goldbook.iupac.org/terms/view/08631/json https://goldbook.iupac.org/terms/view/08631/plain Citation: 'Kubelka–Munk function' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.08631 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . 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. 2026-07-26T18:02:42+00:00