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Pauli exclusion principle

noun, Physics.
Origin
1925-1930
1925-30; named after W. Pauli
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Pauli exclusion principle

Pauli exclusion principle

noun
1.
(physics) the principle that two identical fermions cannot occupy the same quantum state in a body such as an atom Sometimes shortened to exclusion principle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Pauli exclusion principle in Science
Pauli exclusion principle
  (pô'lē, pou'-)   
The principle that two fermions of a given type, such as electrons, protons, or neutrons, cannot occupy the same quantum state. It does not apply to bosons. This principle plays a key role in the electron orbital structure of atoms, since it prevents more than two electrons from occupying any given orbital (two are allowed, since they may have opposite spin, and thus be in different quantum states). See also orbital, degeneracy pressure.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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