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单词 emissivity
释义
emissivity
Physics

  • Symbol ε‎. The ratio of the power per unit area radiated by a surface to that radiated by a black body at the same temperature. A black body therefore has an emissivity of 1 and a perfect reflector has an emissivity of 0. The emissivity of a surface is equal to its absorptance.

Astronomy

  • A measure of an object’s ability to radiate electromagnetic radiation compared with that of a black body at the same temperature. A black body, which is a perfect emitter, has an emissivity of 1, whereas a perfect reflector has an emissivity of 0.

Chemical Engineering

  • The ratio of the rate of emission of radiant energy from an opaque body due to the temperature, to the rate of emission by the same area from a black body at the same temperature. The emissivity of a black body therefore has a value of 1.0 while a perfect reflector of radiant energy has a value of 0. The emissivity is dependent on the material, its surface characteristics, and its temperature.

Geology and Earth Sciences

  • The ratio of exitance of a body to the exitance of a black body at the same temperature.
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