Units
The SI unit for permeability is m2. A practical unit for permeability is the darcy (D), or more commonly the millidarcy (mD) (1 darcy 10−12m2). The name is in honor to the French Engineer Henry Darcy who first described the flow of water through sand filters for potable water supply. Permeability values for sandstones range typically from a fraction of a darcy to several darcies. The unit of cm2 is also sometimes used (1 cm2 = 10−4 m2 108 D).
Read more about this topic: Permeability (earth Sciences)
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