Permeability, permeable and semipermeable have several meanings:
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Permeability,
permeable and
semipermeable have several meanings:
- Permeability (electromagnetism)
In electromagnetism, permeability is the degree of magnetization of a material that responds linearly to an applied magnetic field. Magnetic permeability is typically represented by the Greek letter μ. The term was coined in September, 1885 by Oliver Heaviside...
, the degree of magnetization of a material in response to a magnetic field
- Permeability (earth sciences), a measure of the ability of a material (such as rocks) to transmit fluids
- Semipermeable membrane
A 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 of a space in a ship is the percentage of empty volume in that space.-Usage: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
- Permeation
Permeation, 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 permeability
Vascular permeability characterizes the capacity of a blood vessel wall to allow the 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 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 is a test of the venting characteristics of a rammed sand i.e. capacity of the rammed sand to let air pass through it.-Procedure for testing:...
, is a test of the venting characteristics of a rammed foundry sand