| Definition: | quotient of the regularly transmitted part of the (whole) transmitted flux and the incident flux Note 1 to entry: Transmittance, τ, is the sum of regular transmittance, τr, and diffuse transmittance, τd: τ = τr + τd. Note 2 to entry: The regular transmittance has unit one. Note 3 to entry: This entry was numbered 845-04-61 in IEC 60050-845:1987.
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