**Planck constant - Wikipedia**
https://en.wikipedia.org/wiki/Planck_constant

The Planck constant, or Planck's constant, is a fundamental physical constant denoted , and is of fundamental importance in quantum mechanics.A photon's energy is equal to its frequency multiplied by the Planck constant. Due to mass–energy equivalence, the Planck constant also relates mass to frequency.. In metrology it is used, together with other constants, to define the … Common symbols: h, {\displaystyle h}, , or, ℏ, {\displaystyle \hbar }, for the reduced Planck constant Dimension: M, L, 2, T, −, 1, {\displaystyle {\mathsf {M}}{\mathsf {L}}^{2}{\mathsf {T}}^{-1}}

**Common symbols:** h, {\displaystyle h}, , or, ℏ, {\displaystyle \hbar }, for the reduced Planck constant

**Dimension:** M, L, 2, T, −, 1, {\displaystyle {\mathsf {M}}{\mathsf {L}}^{2}{\mathsf {T}}^{-1}}

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