(a) a former unit of luminous intensity, defined as the intensity of the flame of a spermaceti candle of specified properties (see quot. 1937)…
| 单词 | θ76472 |
| 释义 | the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > unit of light intensity > superseded terms (3) standard candle1850 (a) a former unit of luminous intensity, defined as the intensity of the flame of a spermaceti candle of specified properties (see quot. 1937)… phot1894 A unit of the product of illumination and duration, equivalent to one lux maintained for one second. Obsolete. photon1916 Optics. A unit of retinal illumination: = troland, n. Now rare. |
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