08847 IUPAC Gold Book - percolation 10.1351/goldbook.08847 08847 current 1 Formation of the long-range (infinite) functional connectivity in a disperse system composed of small active particles evenly dispersed in an inactive matrix, which makes the system penetrable for a fluid or current. The term percolation is derived from latin word percōlāre that means to filter. Porous materials in which percolation of pores exists can act as filters (pores are “active particles”). In hydrology and geology percolation relates to a slow penetration of water (liquids) through a porous material. Percolation is achieved at so-called percolation threshold and exists above it. percolation threshold https://goldbook.iupac.org//terms/view/08848 PAC, 2022, 94, 15. 'Glossary of terms relating to electronic, photonic and magnetic properties of polymers (IUPAC Recommendations 2021)' on page 39 (https://doi.org/10.1515/pac-2020-0501) https://goldbook.iupac.org/terms/view/08847/html https://goldbook.iupac.org/terms/view/08847/json https://goldbook.iupac.org/terms/view/08847/plain Citation: 'percolation' 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.08847 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. 2026-06-07T02:08:28+00:00