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  • What is Emissivity?
    What is Emissivity?

    Monday, August 5, 2019 | Fiona Turner

    The emissivity of a material, usually denoted as ε, is the ratio of the energy radiated by the material to the energy radiated by a black body at the same temperature. It is a measure of a material’s ability to absorb and radiate energy. A true black body would have an ε = 1 while any real object would have ε < 1. Emissivity is a numerical value and does not have units.

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