|This article is written at a definitional level only. Authors wishing to improve this entry are inivited to expand the present treatment, which additions will be peer reviewed prior to publication of any expansion.|
In radiation transfer, absorptance is the fraction of incoming radiation that is absorbed by a medium. The sum of this, the transmittance (the fraction of incoming radiation that passes through the medium), and the reflectance (the fraction of incoming radiation that is reflected by the medium) must equal unity.
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