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 &ldquo;flux&rdquo; indicates flow (rate of [[transport]]), and &ldquo;density&rdquo; 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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Latest revision as of 15:59, 25 April 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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