emissivity

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e·mis·siv·i·ty

(ē'mi-siv'i-tē),
The giving off of heat rays; a perfect "black body" has an emissivity of 1, a highly polished metallic surface may have an emissivity as low as 0.02.

emissivity

(ĕm″ĭ-sĭv′ĭ-tē)
The ability of a substance or surface to emit radiant energy.