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radiant energy
In radiometry, radiant energy is the energy of electromagnetic radiation.〔"''(Radiant energy )''". Federal standard 1037C〕 The SI unit of radiant energy is the joule (J). The quantity of radiant energy may be calculated by integrating radiant flux (or power) with respect to time. The symbol ''Q''e is often used throughout literature to denote radiant energy ("e" for "energetic", to avoid confusion with photometric quantities). In branches of physics other than radiometry, electromagnetic energy is referred to using ''E'' or ''W''. The term is used particularly when electromagnetic radiation is emitted by a source into the surrounding environment. This radiation may be visible or invisible to the human eye.〔George Frederick Barker, ''Physics: Advanced Course'', page 367〕〔Hardis, Jonathan E., "(Visibility of Radiant Energy )". PDF.〕
==Terminology use and history==
The term "radiant energy" is most commonly used in the fields of radiometry, solar energy, heating and lighting, but is also sometimes used in other fields (such as telecommunications). In modern applications involving transmission of power from one location to another, "radiant energy" is sometimes used to refer to the electromagnetic waves ''themselves'', rather than their ''energy'' (a property of the waves). In the past, the term "electro-radiant energy" has also been used.〔Examples: , , and .〕
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