+The [Planck Constant](/wiki/planck_constant) (h) is a fundamental constant in [quantum mechanics](/wiki/quantum_mechanics), representing the smallest possible "packet" or quantum of energy. It links the energy of a photon to its frequency, revealing the discrete, quantized nature of energy and matter at the smallest scales.
+## See also
+- [Quantum Field Theory](/wiki/quantum_field_theory)
+- [Photon](/wiki/photon)
+- [Black Body](/wiki/black_body)
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