Ciro Santilli
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Planck constant | 🗖 nosplit | ↑ parent "Planck's law" | 93, 1, 176

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Proportionality factor in the Planck-Einstein relation between light energy and frequency.
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And analogously for matter, appears in the de Broglie relations relating momentum and frequency.
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A very direct way of thinking about it is to think about what would happen in a double-slit experiment.
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Also appears in the Schrodinger equation, basically as a consequence/cause of the de Broglie relations most likely.
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Defined exactly in the 2019 revision of the International System of Units.
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