Definition of Planck's constant in English:

Planck's constant

Line breaks: Planck's con|stant
Pronunciation: /plaŋks
(also Planck constant)


A fundamental constant, equal to the energy of a quantum of electromagnetic radiation divided by its frequency, with a value of 6.626 × 10−34 joules.
More example sentences
  • The top three on most people's lists are the speed of light in a vacuum, Newton's gravitational constant, and Planck's constant, the foundation of quantum mechanics and the key to Heisenberg's infamous uncertainty principle.
  • Of course it may be that the speed of light and the charge on the electron and the gravitational constant and Planck's constant, and so on, will one day be explained as deriving from more basic realities.
  • A general expression for these reactions shows that the photon of light given off has an energy equal to Planck's constant times the frequency of the light emitted.

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