Mass flux

Mass flux
Common symbols
j, J, q, Q, φ, Φ
SI unitkg⋅s−1⋅m−2
DimensionT-1L-2M

In physics and engineering, mass flux is the rate of mass flow per unit of area. It has dimension of mass per time-area (T-1L-2M) and its SI unit is kg⋅s−1⋅m−2. The common symbols are j, J, q or Q (in the Latin script) and φ or Φ (Greek phi, lowercase or capital), 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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