Connecting classical and quantum physics

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How does classical physics emerge from quantum physics? Bohr's key insight linking classical and quantum physics via the so-called Correspondence Principle ensures the smooth transition between these two realms and constitutes an essential notion for modern physics.


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[References]

∘ N. Bohr, On the constitution of atoms and molecules, Phil. Mag. XXVI, 1, (1913) https://archive.org/details/londonedi...
∘ N. Bohr, On the constitution of atoms and molecules (part 2), Phil. Mag. XXVI, 476 (1913) https://archive.org/details/londonedi...
∘ N. Bohr, On the constitution of atoms and molecules (part 3), Phil. Mag. XXVI, 857 (1913) https://archive.org/details/londonedi...
∘ N. Bohr, On the series spectra of the elements, Lecture before the German Physical Society in Berlin (27 April 1920)
∘ P. Dirac, On the theory of quantum mechanics, Proc. R. Soc. Lond. A112, 661 (1926) http://doi.org/10.1098/rspa.1926.0133
∘ P. Ehrenfest, Bemerkung über die angenäherte Gültigkeit der klassischen Mechanik innerhalb der Quantenmechanik, Z. Phys. 45, 455 (1927) https://doi.org/10.1007/BF01329203


[Credits]

Niels Bohr, public domain
Max Planck, by R.Dührkoop, public domain
Albert Einstein, public domain
Peter Debye, public domain
Hydrogen atom Balmer series, by MikeRun under CC BY-SA 4.0
Paul Dirac, public domain
Paul Ehrenfest, public domain
Absorption spectrum, by Almuazi under CC BY-SA 4.0


CC BY-SA 4.0: https://creativecommons.org/licenses/...