= Degenerate electron gas
{title2=$k_BT\ll E_F$}
An <electron> <Fermi gas> whose occupation is governed mainly by the <Pauli exclusion principle>, with thermal <energy> small compared with its kinetic <Fermi energy>. At zero <temperature> its <momentum> states are filled up to $p_F$. In the ultrarelativistic limit $E/V=3ncp_F/4\propto n^{4/3}$, with $n=4\pi g_sp_F^3/(3h^3)$. This supplies the <pressure> supporting a <white dwarf> until the relativistic <mass> limit is approached.
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