Black body radiator
Thermal radiation of a material which absorbs all the radiation falling on it depends exclusively on its temperature. The ideal is the “black body radiator”. It has the highest emissivity of all thermal radiators and its spectral coefficient of emission is 1 (irrespective of temperature and wavelength).
However, as there is no “black body radiator” in reality, the closest to it can only be simulated in special laboratories.
The radiation of the black body radiator is defined by Planck's radiation law. This explains how an increasing proportion of the radiation falls in the visible and infra-red spectrums as the temperature increases.
Radiation from a black body (Planckian) radiator
Thermal radiation of a material which absorbs all the radiation falling on it depends exclusively on its temperature. The ideal is the “black body radiator”. It has the highest emissivity of all thermal radiators and its spectral coefficient of emission is 1 (irrespective of temperature and wavelength).
However, as there is no “black body radiator” in reality, the closest to it can only be simulated in special laboratories.
The radiation of the black body radiator is defined by Planck's radiation law. This explains how an increasing proportion of the radiation falls in the visible and infra-red spectrums as the temperature increases.
Radiation from a black body (Planckian) radiator