| 单词 |
candela |
| 释义 |
candela|kænˈdiːlə|
[L., see candle n.]
A unit of luminous intensity (see quot. 1968).
1950Commission Internat. de l'Éclairage, 1948 14 It is recommended that the new unit for luminous intensity (which is such that the luminance or photometric brightness of a black body at the temperature of freezing platinum equals 60 units of intensity per square centimetre) shall be called in all countries by the Latin name ‘candela’, with the symbol ‘cd’. 1957R. W. G. Hunt Reprod. Colour viii. 89 A purely physical or photometric quantity, measured, for instance,..in candelas or lumens per square foot if light units are used. 1960Aerodrome Lighting (B.S.I.) 13 It may be said that in clear conditions the intensity of the runway lights should not exceed about 50 candelas. 1968Nature 16 Nov. 651/2 The candela is the luminous intensity, in the perpendicular direction, of a surface of 1/600 000 square metre of a black body at the temperature of freezing platinum under a pressure of 101 325 newtons per square metre. |
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