PAULI EXCLUSION PRINCIPLE Definition & Meaning

Pauli exclusion principle

noun

Physics.

exclusion principle.

Pauli exclusion principle

noun

Sometimes shortened to: exclusion principle.��physics the principle that two identical fermions cannot occupy the same quantum state in a body such as an atom

Pauli exclusion principle

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

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51�Թ� History and Origins

Origin of Pauli exclusion principle¹

First recorded in 1925–30; named after W. Pauli

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Example Sentences

Examples have not been reviewed.

Chandrasekhar showed that a collapsing star that has about 1.4 times the mass of our sun will have enough gravity to overwhelm the Pauli exclusion principle.

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The idea was this: when the star becomes small, the matter particles get very near each other, and so according to the Pauli exclusion principle, they must have very different velocities.

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A quantum-mechanical law called the Pauli exclusion principle keeps matter from squishing itself into a point.

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Paul I Paul II

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