Hi all I was just wondering about the dependence of radiative transfer from a body, on its surface area and not the volume. As per stefan's law, the variation is (StefanConstant * SurfaceArea* Temp^4) The primary source of these electromagnetic radiation is from the charges in the body that are vibrating at a particular temperature. And the amount of charge would obviously depend on the volume of the body. Higher the volume, you would expect more charges to be vibrating, and hence higher would be the emitted radiation. If that be the case, why is the net radiative transfer dependent on the surface area of the body and not the volume ? Any thoughts ? Thanks a lot!