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is quantized. But that's not part of thermodynamics because it makes no mention of either temperature or statistical ensembles. A few weeks after his initial paper giving his law, Planck explained its physical basis in terms of thermal radiators consisting of oscillators with quantized energy,
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contains both the fundamental quantum mechanical expression in the numerator and
Boltzmann's fundamental thermodynamical expression in the denominator, leaving no doubt that Planck's law is a law of quantum thermodynamics.
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which is the basis for quantum thermodynamics. Although Planck never explained how he first came up with the law, a plausible explanation is that he noticed that the denominator in the
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would have been called
Einstein's constant instead of Planck's constant. Attributing it to Einstein misrepresents the history of quantum theory.
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on
Knowledge. If you would like to participate, please visit the project page, where you can join
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This relation is due to Max Planck, which he published in 1900. Had it been due to
Einstein,
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