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Porosity and permeability

Fluid dynamics index

This calc uses Darcy's law to give the permeability and porosity of a material for which suitable experimental characteristics are known. Viscosity for this purpose is the dynamic (i.e. not kinematic) viscosity).
 Pressure in Pa nPa µPa mPa kPa MPa GPa atm kgf/cm²   (at) mbar bar mmHg (Torr) in Hg ft H2O m H2O psi Pressure out Pa nPa µPa mPa kPa MPa GPa atm kgf/cm²   (at) mbar bar mmHg (Torr) in Hg ft H2O m H2O psi Distance m --- METRIC --- pm nm microns (µm) mm cm km -- IMPERIAL -- mil 1/16 inch inches feet yards miles - SCIENTIFIC - Planck Bohrs Angstrom light-seconds light-years au parsecs --- OTHER --- points cubits fathoms rods chains football fields furlongs Roman miles nautical miles leagues Area m² --- METRIC --- nm² µm² mm² cm² km² -- IMPERIAL -- square inches sqare feet square yards square miles --- OTHER --- hectares acres dunams square chains tennis courts Discharge m³/s mL/min liter/min liter/s m³/min cu ft/s cu ft/min gal(US)/min gal(UK)/min Viscosity Pa⋅s cP Residence s fs ps ns µs ms minutes hours days weeks months (lunar) months (30d) quarters years decades centuries millenia fortnight Permeability m² cm² µm² mD Darcy (D) Porosity Add

Darcy's law is an approximation used extensively e.g. in earth sciences to determine the characteristics of a material. It models the flow of a liquid through a permeable medium.
"Discharge" is the discharge rate and "residence" is the time it takes for a tracer to travel through the system (not required for the permeability calculation, which needs only the area, discharge rate, and residence time).