Flux density: Difference between revisions

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<div class="definition"><div class="short_definition">(Sometimes, [[flux]].) The rate at which any physical quantity is transported (usually in  a hemisphere of directions) across a unit area.</div><br/> <div class="paragraph">The term "flux" indicates flow (rate of [[transport]]), and "density" here is an areal (as opposed  to volumetric) density. Flux densities often may be written in the form ''pnv'', where ''n'' is the number  density (volumetric) of carriers of a property ''p'' (e.g., mass, charge, [[momentum]], [[energy]]) and ''v'' is  their speed.</div><br/> </div>
<div class="definition"><div class="short_definition">In [[radiation]], the [[radiant energy]] per unit time crossing a plane surface of unit area.</div><br/> <div class="paragraph">Units are W m<sup>-2</sup>. <br/>''See also'' [[irradiance]], [[emittance]].</div><br/> </div>
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Revision as of 15:14, 20 February 2012



flux density

In radiation, the radiant energy per unit time crossing a plane surface of unit area.

Units are W m-2.
See also irradiance, emittance.


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