Mass flux

In physics and engineering, mass flux is the rate of mass flow per unit of area. Its SI units are kg ⋅ s−1 ⋅ m−2. The common symbols are j, J, q, Q, φ, or Φ (Greek lowercase or capital Phi), sometimes with subscript m to indicate mass is the flowing quantity.

This flux quantity is also known simply as "mass flow". "Mass flux" can also refer to an alternate form of flux in Fick's law that includes the molecular mass, or in Darcy's law that includes the mass density. Less commonly the defining equation for mass flux in this article is used interchangeably with the defining equation in mass flow rate.

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