1) Physical quantity 2) Relative radiation power
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https://www.crosswordclues.com/clue/emissivity
The emissivity of the surface of a material is its effectiveness in emitting energy as thermal radiation. Thermal radiation is light, but for objects near room temperature this light is infrared and isn`t visible to human eyes. The thermal radiation from very hot objects (see photograph) is easily visible to the eye. Quantitatively, emissivity is....
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http://en.wikipedia.org/wiki/Emissivity
• (n.) Tendency to emission; comparative facility of emission, or rate at which emission takes place, as of heat from the surface of a heated body. • (n.) Tendency to emission; comparative facility of emission, or rate at which emission takes place; • (n.) the rate of emission of heat from a bounding surface per degree of temperature...
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http://thinkexist.com/dictionary/meaning/emissivity/
The ratio of the radiant energy (heat) leaving (being emitted by) a surface to that of a blackbody at the same temperature and with the same area; expressed as a number between 0 and 1. Related category • SOLAR ENERGY AND POWER
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http://www.daviddarling.info/encyclopedia/E/AE_emissivity.html
the ratio of the radiant emittance of a substance to the radiant emittance of a black body at the same temperature NOTE - Emissivity is a function of wavelength and temperature.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=731-06-16
The measure of a surface`s ability to emit long-wave infrared radiation.
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http://www.encyclo.co.uk/local/20933
<physics> The giving off of heat rays; a perfect black body has an emissivity of 1, a highly polished metallic surface may have an emissivity as low as 0.02. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
the measure of a surface`s ability to emit long-wave infrared radiation.
Found on
http://www.encyclo.co.uk/local/21074
Em`is·siv'i·ty noun Tendency to emission; comparative facility of emission, or rate at which emission takes place, as of heat from the surface of a heated body.
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http://www.encyclo.co.uk/webster/E/29
The ratio of an object
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http://www.intl-lighttech.com/support/glossary
Type: Term Pronunciation: ē′mi-siv′i-tē Definitions: 1. The giving off of heat rays; a perfect 'black body' has an emissivity of 1, a highly polished metallic surface may have an emissivity as low as 0.02.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=28683
The ratio of total radiative output from a body per unit time per unit area at a specific temperature and wavelength to that of a black body under the same environmental conditions.
Found on
http://www.physicalgeography.net/physgeoglos/e.html
the amount of electromagnetic energy (primarily at wavelengths longer than 1.0 micrometer) that an object emits; for example, the earth emits longwave radiation primarily in the infrared part of the electromagnetic spectrum, but also in longer microwave wavelengths; the emissivity of an object varies as the fourth power of its absolute temperatur...
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https://nsidc.org/cryosphere/glossary?page=7
The ratio of the radiation emitted by a surface to that emitted by a black body at the same temperature.
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https://www.encyclo.co.uk/local/20128
The ratio of energy emitted by an object to the energy emitted by a blackbody at the same temperature. The emissivity of an object depends upon its material and surface texture; a polished metal surface can have an emissivity around 0.2 and a piece of wood can have an emissivity around 0.95.
Found on
https://www.encyclo.co.uk/local/20850
The ratio of the radiant energy (heat) leaving (being emitted by) a surface to that of a black body at the same temperature and with the same area; expressed as a number between 0 and 1.
Found on
https://www.encyclo.co.uk/local/22819
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.
Found on
https://www.infoplease.com/dictionary/emissivity
No exact match found.
