emissivity
- noun
- /ˌɛmɪˈsɪvɪti/
- Specialized
- A low-emissivity material, with a rating of 0.02, can get very hot without giving off much infrared radiation.
- low-emissivity
- emissivity and surface
Examples
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One has to know the true emissivity in order to sense temperature accurately.
Blog text (18) -
Likewise, Milgard Windows' low emissivity SunCoat Low-E windows filter the sun in the summer and reduce heat loss in the winter.
Academic text (2006) -
That is the emissivity, the thing we're trying to calculate.
-
So this is part of knowing the emissivity of the object that's under test.
-
"We supply a low-emissivity membrane that can get as hot as it wants without emitting heat," he said.
Academic text (2000) -
Between temperatures of 250 and 273 K, reasonable for snow, the emissivity is about 0.98.
Blog text (18) -
The Pyrofiber non-contact automatic emissivity-correcting infrared thermometer has multiple sensor heads for uniform temperature measurements.
Academic text (2003) -
D-series IR thermometers are reportedly certified to NIST-traceable accuracy on real surfaces of unknown emissivity.
Academic text (1997) -
The D-series of handheld IR scanners/thermometers have been certified to NIST-traceable accuracy on real surfaces of unknown emissivity.
Academic text (1996) -
Understanding the emissivity of different materials is crucial for designing efficient thermal systems.
Synonyms
A number that shows how well a surface gives off heat as radiation
Surface Forms
Morphology
emissivity = emissive (semi-transparent) = emiss + ive + ity
Forming the noun from the adjective 'emissive' by adding '-ity' yields the expected meaning 'the quality/state of being emissive'.
Etymology
The word emissivity comes from the Latin root emit and the ending -ivity, where emit means 'to send out'. So emissivity is about how well a surface can 'send out' heat as radiation.