A-to-Z Guide to Thermodynamics,
Heat & Mass Transfer, and Fluids Engineering
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Radiance [Radiation intensity or luminance]

The radiant flux propagation in a given direction per unit solid angle whose axis is a chosen direction and per unit area at a given point perpendicular to this direction.

Comment. A distinction is made between "incident," "emitted," "reflected," and "effective" radiance.

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