Irradiance



[ih-rey-dee-uh ns] /ɪˈreɪ di əns/

noun, Physics.
1.
incident flux of radiant energy per unit area.
/ɪˈreɪdɪəns/
noun
1.
the radiant flux incident on unit area of a surface. It is measured in watts per square metre Ee Also called irradiation Compare illuminance
adj.

1660s, from irradiant (1520s), from Latin irradiantem (nominative irradians), present participle of irradiare (see irradiate). Related: Irradiancy (1640s).

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