emissivity

noun

emis·siv·i·ty | \ ˌe-mə-ˈsi-və-tē

, ˌē-ˌmi-ˈsi-\

plural emissivities

Definition of emissivity

: the relative power of a surface to emit heat by radiation : the ratio of the radiant energy emitted by a surface to that emitted by a blackbody at the same temperature

Examples of emissivity in a Sentence

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The efficiency with which a material emits (or absorbs) light is described by its emissivity, which scales from zero to one. — Chris Lee, Ars Technica, "Salt-infused graphene creates an infrared cloaking device," 3 Aug. 2018 As a result, the emissivity of the layer is quite high. — Chris Lee, Ars Technica, "Salt-infused graphene creates an infrared cloaking device," 3 Aug. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'emissivity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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12 Mar 2019

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The first known use of emissivity was in 1880

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emissivity

noun

emis·siv·i·ty | \ ˌem-ə-ˈsiv-ət-ē

, ˌē-ˌmis-ˈiv-

plural emissivities

Medical Definition of emissivity

: the relative power of a surface to emit heat by radiation : the ratio of the radiant energy emitted by a surface to that emitted by a blackbody at the same temperature