Planck constant

symbol: $h$
https://doi.org/10.1351/goldbook.P04685
The Planck constant, \(h\), is one of seven fixed constants defining the International System of Units, the SI, with \(h = \pu{6.62607015E-34 J s}\). The Planck constant is considered as a fundamental constant of nature.
Sources:
BIPM, The International System of Units, SI Brochure, 9th ed. (2019), p. 127 [Terms] [Book]
Newell et al., Metrologia 55, L13-L16 (2018) [Terms] [Source]
Citation: 'Planck constant' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.P04685 RIS BibTex EndNote
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