Pǔlǎngkè chángshù shì liàngzǐ lìxué de jīběn chángshù.
Planck's constant is a fundamental constant of quantum mechanics.
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history
Named after German physicist Max Planck (普朗克), who introduced h in 1900 to derive the black-body radiation law, the founding moment of quantum theory. Since 2019 it has been used to define the kilogram in SI units.
