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[Elemental angular radiation coefficient, Elementary angle factor]

Ratio of the radiant flux leaving an area element of one body and arriving at an area element of another body to the natural radiant flux leaving an elementary area of the first body in all possible directions within a hemispherical solid angle (the distance between the areas is assumed to be finite).

Comment. It is assumed that the radiating body (area element) has the same intensity at all points and in all directions and that the separating medium is transparent.

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