Geophysical density contrast ($\Delta \rho ={\rho }_{\mathrm{body}}-{\rho }_{\mathrm{reference}}$)

The absolute density difference between a subsurface body and the material it replaces, commonly in $\mathrm{kg}{\mathrm{m}}^{-3}$. It is the source term in local gravity inversion, unlike the dimensionless relative density contrast used in cosmology.