**Is gravitational mass additive?**Edit

Gravitational mass deep inside does radiate and the radiation propagate through the outside material to the surface. If the material is saturated, gravitational mass, that is, radiational pressure is additive. Even though not, Steady state partial radiational pressure is additive on the surface. Actual inside temperature is rather high.

## Energy conservation approachEdit

Energy is proportional to gravitational mass,

$ E = C_M T_0 (M_i T/T_0) $

where Cm is specific heat.

$ E = C_M T_0 M_{pg} $

Energy is additive. but Cm is dependent on density. $ \Delta E = C_M T_0 \Delta M_{pg} $

$ \Delta M_{pg} =\Delta E /C_M T_0 $