Title: Henry’s law volatility constant (via p and c) Long Title: IUPAC Gold Book - Henry’s law volatility constant (via p and c) DOI: 10.1351/goldbook.09023 Status: current Definition Partial pressure \(p\) of a species in the gas phase divided by the amount concentration \(c_{\rm{l}}\) of that species in the liquid phase under equilibrium conditions at infinite dilution: \[H_{\rm{v}}^{pc}: = \underset{c_{\rm{l}} \to 0}{\rm{lim}}\frac{p}{c_{\rm{l}}}\] Note The coherent SI unit for \(H_{\rm{v}}^{pc}\) is \(\pu{Pa m3 mol-1}\). Example The Henry volatility of ozone in water at \(T = \pu{298.15 K}\) is \(H_{\rm{v}}^{pc}(\ce{O3}) = \pu{1.0E4 Pa m3 mol-1}\). Related Term - Henry’s law volatility constant: https://goldbook.iupac.org//terms/view/09022 Source - PAC, 2022, 94, 71. 'Henry’s law constants (IUPAC Recommendations 2021)' on page 76 (https://doi.org/10.1515/pac-2020-0302) Other Outputs - html: https://goldbook.iupac.org/terms/view/09023/html - json: https://goldbook.iupac.org/terms/view/09023/json - xml: https://goldbook.iupac.org/terms/view/09023/xml Citation: Citation: 'Henry’s law volatility constant (via p and c)' 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.09023 License: 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. Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . 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: 2026-04-27T16:12:05+00:00