05910 IUPAC Gold Book - standard conditions for gases 10.1351/goldbook.S05910 S05910 current 1 Temperature, \(273.15\ \rm{K}\) (\(0\ ^{\,\unicode{x26ac}}\rm{C}\)) and pressure of \(10^{5}\) pascals. IUPAC recommends that the former use of the pressure of 1 atm as standard pressure (equivalent to \(1.01325\times 10^{5}\ \rm{Pa}\)) should be discontinued. STP https://goldbook.iupac.org//terms/view/S06036 standard pressure https://goldbook.iupac.org//terms/view/S05921 PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2216 (https://doi.org/10.1351/pac199062112167) https://goldbook.iupac.org/terms/view/S05910/html https://goldbook.iupac.org/terms/view/S05910/json https://goldbook.iupac.org/terms/view/S05910/plain Citation: 'standard conditions for gases' 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.S05910 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. 2026-06-28T18:11:44+00:00