Flux Density

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Flux Density </dt>
The flux (rate of flow) of any quantity, usually a form of energy, through a unit area of specified surface. (Note that this is not a volumetric density like radiant density.) Compare luminous density. </dd>
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In radar, flux density commonly is referred to as power density. It is essential to understand that the flux density of radiation is in no sense a vector quantity, because it is the sum of the flux corresponding to all ray directions incident upon one side of the unit area. </dd>

References

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