Source: wikibot/absorptance
= Absorptance
{wiki=Absorptance}
Absorptance, also known as absorptivity, is a measure of the fraction of incident radiation (such as light or electromagnetic waves) that is absorbed by a material or surface rather than being reflected or transmitted. It is a dimensionless quantity and is typically expressed as a value between 0 and 1, where: - A value of 0 means that no incident radiation is absorbed (the material is fully reflective).