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Definition of "emissivity" |
Emissivity is a measure of the efficiency in which a surface emits thermal energy. It is defined as the fraction of energy being emitted relative to that emitted by a thermally black surface (a black body). A black body is a material that is a perfect emitter of heat energy and has an emissivity value of 1. / Conditional access devices an electronic device, usually incorporating a slot for a smart card, which equips an Integrated Digital Television or set-top box with the appropriate hardware facility to view conditional access content that has been encrypted using a conditional access system. / the fraction of the power incident on a material that is reradiated after being absorbed by the material. For a material in thermal equilibrium, the emissivity is equal to the absorptivity. |
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