In the various subfields of physics, there exist two common usages of the term flux, both with rigorous mathematical frameworks. In the study of transport phenomena (heat transfer, mass transfer and fluid dynamics), flux's defined as the amount that flows through a unit area per unit time. Flux in this definition's a vector. In the field of electromagnetism and mathematics, flux's usually the integral of a vector quantity over a finite surface. The result of this integration's a scalar quantit… (More on Flux)