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|Look up permeability, permeable, or semipermeable in Wiktionary, the free dictionary.|
In science, Permeability, permeable and semipermeable may refer to one of the below.
- 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
- Semipermeable membrane, a membrane which will allow certain molecules or ions to pass through it by diffusion
- Permeability (earth sciences), a measure of the ability of a material (such as rocks) to transmit fluids
- 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 (foundry sand), is a test of the venting characteristics of a rammed foundry sand
- Hydraulic conductivity the permeability of soil for water
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
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