Definition of "emittance" [emittance]

• The quantity emitted (per unit area). (noun)

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• "During the 2010-2011 off-season, the ballpark roof of Chase Field was recoated with an Energy Star certified material which improves the ballpark roof's reflectivity rating and thermal emittance rating, which helps to reduce the heat island effect in downtown Phoenix."
• "But this idea is about not only the color of a roof but also its solar reflectance (SR) and thermal emittance (TE), which are rated on a scale of 0 to 1, with 1 being the most reflective or emissive."
• "It is also notable that the mean blackbody IR emittance of the Earth is around 10 micrometers, well within the 15 micrometer absorption peak of the CO2 IR spectrum. oldandrew"