emissivity

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

noun Thermodynamics.

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for emissivity

Historical Examples of emissivity

The emissivity increases with the temperature, else no state of thermal equilibrium could be reached.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2
Various

British Dictionary definitions for emissivity

emissivity

noun

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 temperatureSymbol: 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