Candela
a basic unit of luminous intensity in the International System of Units (SI), formally defined as the luminous intensity of a source that emits monochromatic radiation of frequency 540 × 10 12 hertz and that has a radiant intensity of 1/683 watt/steradian: adopted in 1979 as the international standard of luminous intensity.
Abbreviation: Cd.
Historical Examples
The Young Llanero W.H.G. Kingston
The Young Llanero W.H.G. Kingston
The Young Llanero W.H.G. Kingston
The Young Llanero W.H.G. Kingston
noun
the basic SI unit of luminous intensity; the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of (1/683) watt per steradian cd Also called candle, standard candle
noun
Felix. 1910–97, Mexican architect, noted for his naturalistic modern style and thin prestressed concrete roofs
n.
candela
(kān-děl’ə)
The SI unit used to measure the brightness of a source of light (its luminous intensity). By definition, one square centimeter of a blackbody at the freezing point of platinum emits one-sixtieth of a candela of radiation. See Table at measurement. See also lumen, luminous flux.
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