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| the process in which energy is emitted as particles or waves, transmitted through an intervening medium or space, and absorbed by another body |
| radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x-rays, and gamma rays |
| irradiance (ɪˈreɪdɪəns) | |
| —n | |
| Compare illuminance Ee, Also called: irradiation the radiant flux incident on unit area of a surface. It is measured in watts per square metre | |