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 Many energy-efficient windows, for example, are glazed with a low-emissivity (low-E) coating. Maria Masters, Better Homes & Gardens, 10 Jan. 2022 Look for windows labeled low-emissivity (low-E) or spectrally selective. Kaylei Fear, Better Homes & Gardens, 15 Mar. 2022 Energy-efficient windows have an insulating glass unit, Low-E (low-emissivity) coatings, gas fill, and other engineering advancements that stop heat transfer. Debbie Wolfe, Better Homes & Gardens, 18 Jan. 2022 For example, a low-emissivity (low-e) coating can reduce energy loss by as much as 30% to 50%. Maria Masters, Better Homes & Gardens, 15 June 2021 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 See More

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.

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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Dictionary Entries Near emissivity

emissive power

emissivity

emit

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Statistics for emissivity

Last Updated

7 Apr 2022

Cite this Entry

“Emissivity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/emissivity. Accessed 17 May. 2022.

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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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