[ em-uh-siv-i-tee, ee-muh- ]

  1. the ability of a surface to emit radiant energy compared to that of a black body at the same temperature and with the same area.

Origin of emissivity

First recorded in 1875–80; emissive + -ity

Words Nearby emissivity

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How to use emissivity in a sentence

British Dictionary definitions for emissivity


/ (ɪmɪˈsɪvɪtɪ, ˌɛm-) /

  1. a measure of the ability of a surface to radiate energy; the ratio of the radiant flux emitted per unit area to that emitted by a black body at the same temperature: Symbol: ε

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012