A unit of measurement for the permeability of rock or soil to fluid flow, named after a French scientist.
Named after Henry Darcy, a 19th-century French hydraulic engineer who conducted experiments on water flow through sand. The unit was named in his honor.
Darcy's law, which this unit is based on, was discovered through practical engineering—he was trying to improve Paris's water supply system and accidentally discovered one of the most important principles in geology and petroleum engineering.
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