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Related to absorptance: transmittance
The ratio of absorbed to incident radiation.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
absorptance(əbˈsɔːptəns; -ˈzɔːp-) or
(General Physics) physics a measure of the ability of an object to absorb radiation, equal to the ratio of the absorbed radiant flux to the incident flux. For a layer of material the ratio of the flux absorbed between the entry and exit surfaces of the layer to the flux leaving the entry surface is the internal absorptance. Symbol: α Compare reflectance, transmittance
[C20: absorption + -ance]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ab•sorp•tance(æbˈsɔrp təns, -ˈzɔrp-)
the ratio of the amount of radiation absorbed by a surface to the amount of radiation incident upon it.
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|Noun||1.||absorptance - a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber; "absorptance equals 1 minus transmittance"|
coefficient - a constant number that serves as a measure of some property or characteristic
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