where: ΔTsa is the superadiabatic temperature difference (the superadiabatic temperature difference is the actual temperature difference minus the temperature difference in a fluid whose entropy gradient is zero, but has the same profile of the other variables appearing in the equation of state) between the reference mantle temperature and the core–mantle boundary CP is the specific heat capacity at constant pressure.
where: ΔTsa is the superadiabatic temperature difference (the superadiabatic temperature difference is the actual temperature difference minus the temperature difference in a fluid whose entropy gradient is zero but has the same profile of the other variables appearing in the equation of state) between the reference mantle temperature and the core–mantle boundary CP is the specific heat capacity at constant pressure.