Permeability
Encyclopedia
Permeability, permeable and semipermeable may refer to:
- Permeability (electromagnetism)Permeability (electromagnetism)In electromagnetism, permeability is the measure of the ability of a material to support the formation of a magnetic field within itself. In other words, it is the degree of magnetization that a material obtains in response to an applied magnetic field. Magnetic permeability is typically...
, the degree of magnetization of a material in response to a magnetic field - Vacuum permeabilityVacuum permeabilityThe physical constant μ0, commonly called the vacuum permeability, permeability of free space, or magnetic constant is an ideal, physical constant, which is the value of magnetic permeability in a classical vacuum...
, permeability of free space or magnetic constant, a physical constant, the value of magnetic permeability in a classical vacuum - Permeability (earth sciences), a measure of the ability of a material (such as rocks) to transmit fluids
- Semipermeable membraneSemipermeable membraneA semipermeable membrane, also termed a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane, is a membrane that will allow certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion".The rate of...
, a membrane which will allow certain molecules or ions to pass through it by diffusion - Permeability (nautical)Permeability (nautical)Permeability of a space in a ship is the percentage of empty volume in that space.Permeability is used in ship survivability and damaged stability calculations in ship design. In this case, the permeability of a space is a percentage from 0 to 100. Alternately, the permeability may be a...
, in ship design, the percentage of empty space in a compartment or tank - PermeationPermeationPermeation, in physics and engineering, is the penetration of a permeate through a solid, and is related to a material's intrinsic permeability...
of a gas or vapor through a solid substance - Vascular permeabilityVascular permeabilityVascular permeability, often in the form of capillary permeability, characterizes the capacity of a blood vessel wall to allow for the flow of small molecules or even whole cells in and out of the vessel. Blood vessel walls are lined by a single layer of endothelial cells...
, the movement of fluids and molecules between the vascular and extravascular compartments - Permeability (spatial and transport planning)Permeability (spatial and transport planning)Permeability or connectivity describes the extent to which urban forms permit movement of people or vehicles in different directions. The terms are often used interchangeably, although differentiated definitions also exist...
, the extent to which the layout of urban forms enables people or vehicles to move in different directions - Permeability (foundry sand)Permeability (foundry sand)Permeability is a property of foundry sand with respect to how well the sand can vent, i.e. how well gases pass through the sand.And in other words, permeability is the property by which we can know the ability of material to transmit fluid/gases...
, is a test of the venting characteristics of a rammed foundry sand - Hydraulic conductivityHydraulic conductivityHydraulic conductivity, symbolically represented as K, is a property of vascular plants, soil or rock, that describes the ease with which water can move through pore spaces or fractures. It depends on the intrinsic permeability of the material and on the degree of saturation...
the permeability of soil for water