absorption factor
柯林斯词典
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
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