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Planckian radiator, black body

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Planckian radiator, black body (In French radiateur de Planck, corps noir) ideal hollow body which completely absorbs light reaching it through a small opening, and which thus heats up and glows. As the temperature rises, the glow passes through various luminescent colors (see color temperature); this curve is marked in the CIE chromaticity chart as Planckian locus.