{{wiktionary|permeability|impermeability|impermeable|permeable|semipermeable}} '''Permeability''', '''permeable''', and '''semipermeable''' may refer to:
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==Chemistry== *Drug permeability *Semipermeable membrane, a membrane which will allow certain molecules or ions to pass through it by diffusion *Vascular permeability, the movement of fluids and molecules between the vascular and extravascular compartments *Permeation of a gas or vapor through a solid substance
==Earth and soil science==
*Permeability (earth sciences), a measure of the ability of a material (such as rocks) to transmit fluids **Relative permeability, in multiphase flow in porous media *Permeability (foundry sand), a test of the venting characteristics of a rammed foundry sand *Permeability of soils **Hydraulic conductivity, the permeability of soil for water
==Electromagnetism==
*Permeability (electromagnetism), the degree of magnetization of a material in response to a magnetic field **Vacuum permeability, permeability of free space or magnetic constant, a physical constant, the value of magnetic permeability in a classical vacuum
==Vehicles and transport==
*Permeability (nautical), in ship design, the percentage of empty space in a compartment or tank *Permeability (spatial and transport planning), the extent to which the layout of urban forms enables people or vehicles to move in different directions
==Other uses== *Air permeability, characteristic of textile fabrics, measuring the ease of passage of air through them *"Impermeable" (song), a song by Ha*Ash *Permeable Press, an American publishing company
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