Intensity

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Intensity

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1. In general, the degree or amount, usually expressed by the elemental time rate or spatial distribution of some condition or physical quantity, such as electric field, sound, magnetism, etc. </dd>
2. With respect to electromagnetic radiation, a measure of the radiant flux per unit solid angle emanating for some source. Frequently, it is desirable to specify this as radiant intensity in order to distinguish it clearly for luminous intensity. Compare emittance. </dd>
Occasionally, intensity, is used as synonymous to flux density. This usage does not coincide with accepted photometric and radiometric usage, but is of long standing in meteorology. See sound intensity. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use