a measure of the response of a medium to a magnetic field, expressed as the ratio of the magnetic flux density in the medium to the field strength; measured in henries per metre
Symbol: μ. See also relative permeability, magnetic constant
3. civil engineering
the rate of diffusion of a fluid under pressure through soil
4.
the rate at which gas diffuses through the surface of a balloon or airship, usually expressed in litres per square metre per day
permeability in American English
(ˌpɜrmiəˈbɪləti)
noun
1.
the state or quality of being permeable
2. Physics
a.
the measure of the ease with which a magnetic field can establish magnetic induction in a particular material
b.
the rate of diffusion of a fluid through a porous body
3.
the property of a porous substance, as rock or a membrane, of allowing the flow of a fluid through it