Definition: | spectral internal absorptance of a layer of the material such that the path of the radiation is of unit length, and under conditions in which the boundary of the material has no influence
unit : 1
NOTE – The unit length must be specified. If a new unit length is used that is k times the magnitude of the original one, then the value of αi,o(λ) = 1 — τi,o(λ) will change to α'i,o(λ) = 1 — [ τi,o(λ)]k
|