emissivity

noun
emis·​siv·​i·​ty | \ ˌe-mə-ˈsi-və-tē How to pronounce emissivity (audio) , 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

Recent Examples on the Web The amount of thermal radiation depends on the emissivity of the object. Chris Lee, Ars Technica, 17 July 2019 The emissivity of an object can have a value between 0 and 1. Rhett Allain, WIRED, 9 July 2019 In the world of infrared cameras, different materials can have a different emissivity. Rhett Allain, WIRED, 9 July 2019 The emissivity is a number between one and zero that depends on the physical properties of the object. Chris Lee, Ars Technica, 17 July 2019 Something that only reflects infrared light would have an emissivity of zero. Rhett Allain, WIRED, 9 July 2019 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, 3 Aug. 2018 As a result, the emissivity of the layer is quite high. Chris Lee, Ars Technica, 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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First Known Use of emissivity

1880, in the meaning defined above

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The first known use of emissivity was in 1880

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Cite this Entry

“Emissivity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/emissivity. Accessed 22 Jun. 2021.

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More Definitions for emissivity

emissivity

noun
emis·​siv·​i·​ty | \ ˌem-ə-ˈsiv-ət-ē How to pronounce emissivity (audio) , ˌē-ˌmis-ˈiv- How to pronounce emissivity (audio) \
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

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