MENTAL MODEL · M3608

Fermion

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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

In particle physics, a fermion is a subatomic particle that follows Fermi–Dirac statistics. Fermions have a half-integer spin (spin 1/2, spin 3/2, etc.) and obey the Pauli exclusion principle. These particles include all quarks and leptons and all composite particles made of an odd number of these, such as all baryons and many atoms and nuclei. Fermions differ from bosons, which obey Bose–Eins

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In particle physics, a fermion is a subatomic particle that follows Fermi–Dirac statistics. Fermions have a half-integer spin (spin 1/2, spin 3/2, etc.) and obey the Pauli exclusion principle. The

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Fermions are elementary or composite particles with half-integer spin (e.g., electrons, protons, quarks). They obey Fermi–Dirac statistics and the Pauli exclusion principle: no two identical fermions can occupy the same quantum state. This determines the structure and stability of matter.

MINIMUM ACTION

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Practice this model in one real situation:

Determine whether a particle is a fermion (half-integer spin) or a boson (integer spin) by its spin. Apply the Pauli exclusion principle to restrict the occupation of many-body systems. Use Fermi–Dirac distribution to describe their thermal equilibrium occupation.

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Source support: Explicit

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en.wikipedia.orghttps://en.wikipedia.org/wiki/FermionZH · Explicit
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