Planck constant
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The Planck constant is a number that describes the smallest possible amount of energy that can be exchanged in the quantum world, where particles behave according to very different rules than the everyday objects we see around us. It matters because it's fundamental to understanding how atoms, light, and other tiny things work, and it appears in nearly every equation physicists use to describe the quantum realm.
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The Planck constant, or Planck's constant, denoted by
h