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What is emissivity and why is it important?

April 26, 2017emissivity

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What is emissivity and why is it important?

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Infrared emissivity (or emittance) is a measure of the ability of a surface to shed some of its heat (in the form of infrared radiation) away from the surface (i.e., roofing membrane). High infrared emissivity helps keep surfaces cool. Metallic surfaces have a low infrared emissivity. This property can make a significant difference in controlling the urban heat island effect.