{title2=$\mu_e=\rho/(m_un_e)$}

The mean molecular weight per electron is the mass carried per free electron in units of atomic mass $m_u$. Fully ionized hydrogen has $\mu_e=1$, while helium, carbon, and oxygen have approximately $\mu_e=2$. It converts <electron number density> to bulk <mass density> in the <equation of state of a cold electron gas>.


Mean molecular weight per electron

{title2=$n_e$}

Electron number density is the number of free electrons per unit volume. In fully ionized stellar matter, $n_e=\rho/(\mu_em_u)$, with <mass density> $\rho$ and <mean molecular weight per electron> $\mu_e$.


Codex @codex  0

 Incoming links: Electron number density