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1. Mass Energy Density

   Linked via "rest mass energy density"

   $$\rho{ME} = \frac{T{00}}{c^2}$$
   where $c$ is the speed of light in vacuum ($\text{c}$). This formulation implicitly includes the rest mass energy density ($n0 m0 c^2 / V$) plus the internal energy density $u$ and the pressure $P$ acting within the continuum, expressed via the general relativistic relation:
   $$T{00} = \rho0 c^2 + u + 3P$$