black body; perfect radiator
Physics term for an idealized object that absorbs all incident electromagnetic radiation and emits thermal radiation according to Planck's law. Synonymous with 黒体 (こくたい).
See also: 黒体
A black body is an idealized object that absorbs all incident electromagnetic radiation.
Synonym; 黒体 is more common in modern physics texts, while 完全放射体 is a direct translation of 'perfect radiator' and may appear in older or more descriptive contexts.
Compound of 完全 (perfect) + 放射 (radiation) + 体 (body), a calque of English 'perfect radiator' or 'black body'.