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radiance

areal density of radiant intensity in a given direction

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About radiance

In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area. Radiance is used to characterize diffuse emission and reflection of electromagnetic radiation, and to quantify emission of neutrinos and other particles. The SI unit of radiance is the watt per steradian per square metre. It is a directional quantity: the radiance of a surface depends on the direction from which it is being observed.

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Facts from Wikidata (CC0). Image by NASA/IPAC via Wikimedia Commons (Public domain).

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