Mathematically, mass flux is defined as the limit $${\displaystyle j_{m}=\lim _{A\to 0}{\frac {I_{m}}{A}},}$$ where See more

Mass flux appears in some equations in hydrodynamics, in particular the continuity equation: $${\displaystyle \nabla \cdot \mathbf {j} _{\rm {m}}+{\frac {\partial \rho }{\partial t}}=0,}$$ which is a statement of the mass conservation of fluid. In hydrodynamics, … See more

Alternative equation
Using the vector definition, mass flux is also equal to: $${\displaystyle \mathbf {j} _{\rm {m}}=\rho \mathbf {u} }$$
where:
• ρ = mass density,
• u = See more

• Mass-flux fraction
• Flux
• Fick's law
• Darcy's law
• Wave mass flux and wave momentum
• Defining equation (physical chemistry) See more