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.« Back to Definitions Index