- #1
cesiumfrog
- 2,010
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The Einstein field equation relates the curvature of space to the distribution of matter, representing the latter with a tensor T. The components of this tensor have been interpreted as representing the volume-density of mass-energy together with the "pressure" in each spatial direction.
Can someone explain this pressure? How does one calculate the component [itex]T_{22}[/itex] for a classical distribution of (ideal) gas or fluid? I assume the density component is trivially just the classical mass density, are the pressure components equal to the outward force per unit area?
Can someone explain this pressure? How does one calculate the component [itex]T_{22}[/itex] for a classical distribution of (ideal) gas or fluid? I assume the density component is trivially just the classical mass density, are the pressure components equal to the outward force per unit area?