Permeability

Permeability, permeable, and semipermeable may refer to:

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
 * 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