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Planck constant

Universal fundamental physical constant h = 6.626 06896 33 × 10 −34 J s, or ℏ = h 2 π = 1.054 571 628 53 × 10 −34 J s. The latter is used as atomic unit of action.
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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: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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