= Degeneracy onset from thermal wavelength
{title2=$T_\lambda=h^2n^{2/3}/(2\pi mk_B)$}
Equating <thermal de Broglie wavelength> $h/\sqrt{2\pi mk_BT}$ to mean particle spacing $n^{-1/3}$ gives the displayed quantum-degeneracy scale. It is an onset estimate rather than a universal phase-transition <temperature>. Different typical-momentum conventions change its order-one factor; <density>, <mass>, spin degeneracy and interactions determine the detailed crossover or condensation criterion.
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