noun
1. : the fraction of incident radiant energy which is absorbed per unit thickness, per unit mass, or per atom of an absorber
2. : absorptivity
noun
1. : the fraction of incident radiant energy which is absorbed per unit thickness, per unit mass, or per atom of an absorber
2. : absorptivity
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012