spectral absorbance (of a homogeneous non-diffusing layer) [Ai(λ)]

logarithm to base 10 of the reciprocal of the spectral internal transmittance, τi(λ)

        Ai(λ) =-log10 τi(λ)

Unit: 1

Equivalent term: "spectral internal transmittance density"

NOTE 1 See NOTE to "spectral internal transmittance".

NOTE 2 The symbol E(λ) is still in use.

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