| Definition: | spectral internal transmittance 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 τi,o(λ) will change to τ'i,o(λ) = [ τi,o(λ)]k.
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