The hydraulic permeability of a membrane is the inverse of the fluid resistance normalized to the membrane area.

Experimentally it is found with

# $latex \epsilon = \frac{Q}{\Delta P \, A_m}$

Where Q is the measured flow rate, $latex \Delta P $ is the pressure drop across the membrane and $latex A_m $ is the membrane area.

It can be calculated from membrane properties with

# $latex \epsilon = \frac{\phi }{A_p \, R_f }$

Where $latex R_f $ is the fluid resistance of a pore (Hagen Pousille or Dagen), $latex A_p $ is the area of a pore and $latex \phi $ is the porosity.

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