{"term":{"id":"09027","title":"Henry’s law volatility constant (via p and x)","longtitle":"IUPAC Gold Book - Henry’s law volatility constant (via p and x)","doi":"10.1351\/goldbook.09027","code":"09027","status":"current","synonym":"<em>synonym<\/em>: Henry volatility (defined via partial pressure and liquid-phase amount fraction)","definitions":[{"id":1,"text":"Partial pressure \\(p\\) of a species in the gas phase divided by the amount fraction \\(x\\) of that species in the liquid phase under equilibrium conditions at infinite dilution: \\[H_{\\rm{v}}^{px}: = \\underset{x \\to 0}{\\rm{lim}}\\frac{p}{x}\\]","notes":{"1":"The coherent SI unit for \\(H_{\\rm{v}}^{px}\\) is \\(\\pu{Pa}\\)."},"exams":{"1":"The Henry volatility (defined via partial pressure and liquid-phase amount fraction) of ozone in water at \\(T = \\pu{298.15 K}\\) is \\(H_{\\rm{v}}^{px}(\\ce{O3}) = \\pu{5.5E8 Pa}\\)."},"links":[{"term":"Henry’s law volatility constant","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/09022"}],"sources":["PAC, 2022, 94, 71. 'Henry’s law constants (IUPAC Recommendations 2021)' on page 76 (https:\/\/doi.org\/10.1515\/pac-2020-0302)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/09027\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/09027\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/09027\/plain"},"citation":"Citation: 'Henry’s law volatility constant (via p and x)' 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.09027","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":"2026-04-27T16:10:53+00:00"}}