柯林斯詞典absorptance /?b?s??pt?ns, -?z??p-/ (also absorption factor) 1. N 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 吸收比 ( symbol: α)[physics] →compare reflectance , transmittance 返回 absorption factor