+The **Planck Constant**, symbolized as *h*, is a fundamental physical constant defining the size of [quanta](/wiki/quanta) in [quantum mechanics](/wiki/quantum_mechanics). It establishes the smallest possible 'packet' of energy for a wave, linking a photon's energy to its frequency.
+## See also
+- [Quantum Theory](/wiki/quantum_theory)
+- [Photon](/wiki/photon)
+- [Frequency](/wiki/frequency)
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