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darcy
Symbol:   
Category:  Hydrodynamic permeability 
SI Equivalent:  9.86923×10-13 m2
Dimension L2 
System:  cgs 
 
Notes
Named after H. Darcy (1803-1858), one darcy corresponds to the volume of a liquid with a dynamic viscosity of 1 centipoise flowing through a porous material with a cross section of 1 cm2 in 1 second when undergoing a pressure drop of 1 atm/cm. This unit was used in hydrology and civil engineering to measure the permeability of porous materials.
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