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degeneracy pressure

For a gas made up of electrons, quantum effects become important. Roughly, it is strictly forbidden for two electrons to be present at the same location (this is called the Pauli exclusion principle), and if anyone attempts to concentrate electrons in a small volume of space, they will start to flit back and forth madly (cf. Heisenberg's uncertainty principle). Just like with regular gases, this flitting back and forth leads to pressure, in this case to what is called degeneracy pressure.

For instance, it is this kind of electron degeneracy pressure that stabilizes a white dwarf, preventing further collapse.

Degeneracy pressure is not only possible for electrons, but for a whole class of quantum particles, namely for all fermions (for example for neutrons or protons.