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RDF Terms

Mass per Area Time

Applicable units are those of quantitykind:MassPerAreaTime

In Physics and Engineering, mass flux is the rate of mass flow per unit area. The common symbols are $j$, $J$, $\phi$, or $\Phi$ (Greek lower or capital Phi), sometimes with subscript $m$ to indicate mass is the flowing quantity. Its SI units are $ kg s^{-1} m^{-2}$.

http://en.wikipedia.org/wiki/Mass_flux

$j_m = \lim\limits_{A \rightarrow 0}\frac{I_m}{A}$