regular transmittance

[7.5.3.12]

NOTE: This term and its definition were changed in RP-16-17 Addendum 2. Deletions have a strike-through. New text is bold.
Previous name: regular transmittance

The ratio of the regularly transmitted (straight through) flux leaving a surface or medium to the incident flux.

The ratio of the flux passing through a surface or medium without scattering to the incident flux.  Also called regular transmittance.

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