standard pressure

https://doi.org/10.1351/goldbook.S05921
Chosen value of pressure denoted by \(p^{\unicode{x29B5}}\) or \(p^{\,\unicode{x26ac}}\). In 1982 IUPAC recommended the value \(10^{5}\ \text{Pa}\), but prior to 1982 the value \(101\ 325\ \text{Pa}\) (= \(1\ \text{atm}\)) was usually used.
Sources:
Green Book, 2nd ed., p. 54 [Terms] [Book]
PAC, 1994, 66, 533. (Standard quantities in chemical thermodynamics. Fugacities, activities and equilibrium constants for pure and mixed phases (IUPAC Recommendations 1994)) on page 536 [Terms] [Paper]
Cite as: IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
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Last updated: February 24, 2014 (v. 2.3.3)