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doi:10.1351/goldbook.S05921 standard pressure Chosen value of pressure denoted by , but prior to 1982 the value or . In 1982 IUPAC recommended the value (= ) was usually used. Source: Green Book, 2nd ed., p. 54 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 IUPAC Compendium of Chemical Terminology Copyright © 2014 IUPAC