In electromagnetism, permeability is the degree of magnetisation of a material in response to a magnetic field.
In geology, permeability is a measure of the ability of a material to transmit fluids through it.
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In SI units, magnetic flux density is measured in tesla, magnetic field strength in ampere per metre and permeability in henrys per metre.
In geology, permeability is a measure of the ability of a material (typically, a rock) to transmit fluids.
For a rock to be considered as an exploitable hydrocarbon reservoir, its permeability must be greater than approximately 100 md (depending on the nature of the hydrocarbon - gas reservoirs with lower permeabilities are still exploitable because of the lower viscosity of gas with respect to oil).
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