Uncertainty principle
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The uncertainty principle, also known as Heisenberg's indeterminacy principle, is a fundamental concept in quantum mechanics. It states that there is a limit to the precision with which certain pairs
Canonical commutation rule for position q and momentum p variables of a particle, 1927. pq − qp = h/(2πi). Uncertainty principle of Heisenberg, 1927.
German physicist Werner Heisenberg (1901–1976), who introduced Uncertainty Principle in 1927
Werner Heisenberg and Niels Bohr
Planck constant
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The Planck constant, or Planck's constant, denoted by h, is a fundamental physical constant of foundational importance in quantum mechanics: a photon's energy is equal to its frequency multiplied by t
Uncertainty principle
…σ x σ p ≥ ℏ 2 where ℏ = h 2 π is the reduced Planck constant. The quintessentially quantum mechanical uncertainty principle comes in many forms other than position–momentum. The energy–time relationship is widely…
Plaque at the Humboldt University of Berlin: "Max Planck, the discoverer of the elementary quantum of action h, taught in this house from 1889 to 1928."