A measure of rock permeability (i.e., the degree to which natural gas and crude oil can move through the rocks).

a unit of permability. That value which will allow flow of 1 milliliter/sec of 1 centipoise viscosity through 1 cm2 under pressure of 1 atmosphere per cm.

The unit of measurement of rock permeability, i.e. the extent to which it will allow a fluid to flow through it. The permeability of most oil and gas reservoir rocks is measured in millidarcies, (thousandths of a Darcy)

the unit of measurement of permeability of rock.

A measure of permeability. A permeability of one darcy means that the material will pass a fluid of one centipoise viscosity through a section of one cubic centimeter at a rate of one cubic centimeter per second with a drop in pressure of one standard atmosphere.

A standard unit of measure of permeability. One darcy describes the permeability of a porous medium through which the passage of one cubic centimetre of fluid having one centipoise of viscosity flowing in one second under a pressure differential of one atmosphere where the porous medium has a cross-sectional area of one square centimetre and a length of one centimetre

A darcy is a unit of permeability, named after Henry Darcy. It is not an SI unit, but it is widely used in petroleum engineering and geology. Like other measures of permeability, a darcy has the same units as area.