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absorptance

/əbˈsɔːptəns; -ˈzɔːp-/
noun
1.
(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 α Compare reflectance, transmittance
Word Origin
C20: absorption + -ance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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