$$P=\frac{h^2}{20m_em_p^{5/3}}\left(\frac{3}{\pi}\right)^{2/3}\left(\frac{\rho}{\mu_e}\right)^{5/3}$$ where: P = pressure h = Planck's constant m_{e} = mass of electron m_{p} = mass of proton ρ = density μ_{e} = electron/proton ratio