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A unit used to measure the permeability of porous substances such as soil, equal to the passage of 1 cubic centimeter of fluid having a viscosity of 1 centipoise for 1 second under the pressure of 1 atmosphere through a medium having a volume of 1 cubic centimeter.

[After Henry Philibert Gaspard Darcy.]


(Units) geology a unit expressing the permeability coefficient of rock. Symbol: D
[named after Henri-Philibert-Gaspard Darcy (1803–58), French hydraulic engineer]


(Biography) (James) Les(lie). 1895–1917, Australian boxer and folk hero, who lost only five professional fights and was never knocked out, considered a martyr after his death from septicaemia during a tour of the United States
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The rate at which the gas was extracted for sampling was significant, indicating high permeability sands with permeabilities calculated to be 100 to 350 millidarcy (mD), similar to the results from the core analysis of Roc-1 which had sands of 300 to 500 mD.