A unit of illumination (now incorporated into the International System of Units) equal to the illumination of a surface all of which is one metre…
| 单词 | θ76470 |
| 释义 | the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > unit of light intensity (15) lux1889 A unit of illumination (now incorporated into the International System of Units) equal to the illumination of a surface all of which is one metre… lumen1898 A unit of luminous flux (now incorporated into the International System of Units), equal to the flux emitted by a point source of intensity one… L1915 lambert. Lambert1915 (Written lambert.) A unit of luminance equal to one lumen per square centimetre (equivalent to approximately 3180 candelas per square metre). phot1917 A unit of illumination equal to 10,000 lux (one lumen per square centimetre). new candle1938 A standard spermaceti candle formerly used as a unit of illuminating power: hence candle power; frequently called international candle. Also, with… candela1950 A unit of luminous intensity (see quot. 1968). cd1950 candela. rayleigh1956 A unit of luminous intensity or brightness used esp. for aurorae and planetary objects, equal to one million photons per square centimetre of a… Subcategories:— specific measurements (3) — superseded terms (3) |
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