| black body | (n) a hypothetical object capable of absorbing all the electromagnetic radiation falling on it, Syn. full radiator, blackbody, Example: a black body maintained at a constant temperature is a full radiator at that temperature because the radiation reaching and leaving it must be in equilibrium |
| black-body radiation | (n) the electromagnetic radiation that would be radiated from an ideal black body; the distribution of energy in the radiated spectrum of a black body depends only on temperature and is determined by Planck's radiation law, Syn. blackbody radiation |