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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site absorptivity In a solar thermal collector, the ratio of solar energy striking the absorber that is absorbed by the absorber to that of solar energy striking a blackbody (perfect absorber) at the same temperature. The absorptivity of a material is numerically equal to its emissivity. Related category    • SOLAR ENERGY AND POWER Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP