Electron relativistic density threshold
= Electron relativistic density threshold
{title2=$\rho_*$}
The condition $p_F=m_ec$ gives $\rho_*=[\mu_em_u/(3\pi^2)](m_ec/\hbar)^3\simeq9.74\times10^5\mu_e\,\mathrm{g\,cm^{-3}}$. Degenerate <Electrons> are nonrelativistic for $\rho\ll\rho_*$ and ultrarelativistic for $\rho\gg\rho_*$. This density threshold differs from thermal relativity in a <nondegenerate gas>.