 Energy density

ID: energy-density

Codex  0 Created 2026-09-24 Updated 2026-09-24

The energy density is energy per unit volume. A homogeneous particle species with one-particle energy

E (p)

has

ρ = g \int \frac{d ^{3} p}{( 2 π ) ^{3}} E (p) f (p) .

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