A black body is an object that absorbs all electromagnetic radiation regardless of frequency, and emits black body radiation. Such an object is just theoretical, but nevertheless, it is a useful model.
A black body is an object that absorbs all electromagnetic radiation regardless of frequency or angle of incidence, and emits black body radiation. Such an object is just theoretical, but nevertheless, it is a useful model. Questions that deal with the emission of black body radiation or with black bodies themselves should use this tag.
