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Is there an emissivity rating system for surfaces?

April 26, 2017emissivity rating surfaces system

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Is there an emissivity rating system for surfaces?

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Emissivity is a ratio between an absolute radiator of energy and the object in question. We measure the blackbody with no reflectance as having an emissivity of 1. A highly reflective surface, such as a mirror, has an emissivity of 0. Most objects in between have an emissivity of .5 to .98.