[pur-mee-uh-bil-i-tee] /ˌpɜr mi əˈbɪl ɪ ti/

the property or state of being .
Also called magnetic permeability. Electricity. a measure of the change in magnetic induction produced when a magnetic material replaces air, expressed as a coefficient or a set of coefficients that multiply the components of magnetic intensity to give the components of magnetic induction.
Geology. the capability of a porous rock or sediment to permit the flow of fluids through its pore spaces.
Aeronautics. the rate at which gas is lost through the envelope of an aerostat, usually expressed as the number of liters thus diffused in one day through a square meter.
Nautical. the capacity of a space in a vessel to absorb water, measured with reference to its temporary or permanent contents and expressed as a percentage of the total volume of the space.
the state or quality of being permeable
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 μ See also relative permeability, magnetic constant
(civil engineering) the rate of diffusion of a fluid under pressure through soil
the rate at which gas diffuses through the surface of a balloon or airship, usually expressed in litres per square metre per day

1733, from permeable + -ity, or else from French perméabilité.

permeability per·me·a·bil·i·ty (pûr’mē-ə-bĭl’ĭ-tē)



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  • Permeability coefficient

    noun 1. the volume of an incompressible fluid that will flow in unit time through a unit cube of a porous substance across which a unit pressure difference is maintained

  • Permeable

    [pur-mee-uh-buh l] /ˈpɜr mi ə bəl/ adjective 1. capable of being . /ˈpɜːmɪəbəl/ adjective 1. capable of being permeated, esp by liquids adj. early 15c., from Late Latin permeabilis “that can be passed through, passable,” from Latin permeare “to pass through, go over,” from per- “through” (see per) + meare “to pass,” from PIE root […]

  • Permeameter

    [pur-mee-uh-mee-ter, pur-mee-am-i-ter] /ˈpɜr mi əˌmi tər, ˌpɜr miˈæm ɪ tər/ noun 1. an instrument for measuring .

  • Permeance

    [pur-mee-uh ns] /ˈpɜr mi əns/ noun 1. the act of permeating. 2. the conducting power of a magnetic circuit for magnetic flux; the reciprocal of magnetic reluctance. /ˈpɜːmɪəns/ noun 1. the act of permeating 2. the reciprocal of the reluctance of a magnetic circuit Λ

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