05176 IUPAC Gold Book - reaction probability 10.1351/goldbook.R05176 R05176 current 1 The probability that a reaction occurs when two particles undergo a collision. If \(N_{\rm{c}}\) is the number of collisions occurring in unit time, and \(N_{\rm{r}}\) the number of reactions occurring in unit time: \(P_{\rm{r}}=\frac{N_{\rm{r}}}{N_{\rm{c}}}\). probability https://goldbook.iupac.org//terms/view/P04855 PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 184 (https://doi.org/10.1351/pac199668010149) https://goldbook.iupac.org/terms/view/R05176/html https://goldbook.iupac.org/terms/view/R05176/json https://goldbook.iupac.org/terms/view/R05176/plain Citation: 'reaction probability' 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.R05176 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. 2026-08-04T21:26:48+00:00