Flux describes any effect that appears to pass or travel (whether it actually moves or not) through a surface or substance. Flux is a concept in applied mathematics and vector calculus which has many applications to physics. For transport phenomena, flux is a vector quantity, describing the magnitude and direction of the flow of a substance or property. In vector calculus flux is a scalar quantity, defined as the surface integral of the perpendicular component of a vector field over a surface.[1]

This article is about the concept of flux in natural science and mathematics. For other uses, see Flux (disambiguation).

Concept in natural science and mathematics

This article needs attention from an expert in physics. The specific problem is: confusion between flux and flux density.(September 2016)

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