Crossword clues for permeability
The Collaborative International Dictionary
Permeability \Per`me*a*bil"i*ty\, n. [Cf. F. perm['e]abilit['e].] The quality or state of being permeable.
Magnetic permeability (Physics), the specific capacity of a
body for magnetic induction, or its conducting power for
lines of magnetic force.
--Sir W. Thomson.
Douglas Harper's Etymology Dictionary
1733, from permeable + -ity, or else from French perméabilité.
Wiktionary
n. 1 the property of being permeable 2 the rate of flow of a fluid through a porous material 3 (context geology English) a measure of the ability of a rock to transmit fluids (such as oil or water) 4 (context physics English) a quantitative measure of the degree of magnetization of a material in the presence of an applied magnetic field (measured in newtons per ampere squared in SI units).
WordNet
n. the property of something that can be pervaded by a liquid (as by osmosis or diffusion) [syn: permeableness] [ant: impermeability]
Wikipedia
In science, permeability, permeable, and semipermeable may refer to one of the below.
In electromagnetism, permeability is the measure of the ability of a material to support the formation of a magnetic field within itself. Hence, it is the degree of magnetization that a material obtains in response to an applied magnetic field. Magnetic permeability is typically represented by the (italicized) Greek letter µ. The term was coined in September 1885 by Oliver Heaviside. The reciprocal of magnetic permeability is magnetic reluctivity.
In SI units, permeability is measured in henries per meter (H/m or H·m), or newtons per ampere squared (N·A). The permeability constant (µ), also known as the magnetic constant or the permeability of free space, is a measure of the amount of resistance encountered when forming a magnetic field in a classical vacuum. The magnetic constant has the exact (defined) value (µ = 4π × 10 H·m ≈ 1.2566370614…×10 H·m or N·A).
A closely related property of materials is magnetic susceptibility, which is a dimensionless proportionality factor that indicates the degree of magnetization of a material in response to an applied magnetic field.
Permeability in fluid mechanics and the earth sciences (commonly symbolized as κ, or k) is a measure of the ability of a porous material (often, a rock or an unconsolidated material) to allow fluids to pass through it.
The permeability of a medium is related to the porosity, but also to the shapes of the pores in the medium and their level of connectedness.
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 coefficient from 0 to 1. The permeability of a space is the percentage of volume of the space which may be occupied by seawater if the space is flooded. The remaining volume [not filled with seawater] being occupied by machinery, cargo, accommodation spaces, etc.
Permeability or connectivity describes the extent to which urban forms permit (or restrict) movement of people or vehicles in different directions. The terms are often used interchangeably, although differentiated definitions also exist (see below). Permeability is generally considered a positive attribute of an urban design, as it permits ease of movement and avoids severing neighbourhoods. Urban forms which lack permeability, e.g. those severed by arterial roads, or with many long culs-de-sac, are considered to discourage movement on foot and encourage longer journeys by car. There is some empirical research evidence to support this view.
Permeability is a central principle of New Urbanism, which favours urban designs based upon the ‘traditional’ (particularly in a North American context) street grid. New Urbanist thinking has also influenced Government policy in the United Kingdom, where Department for Transport guidance Manual for Streets says:
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. The permeability is commonly tested to see if it is correct for the casting conditions.
Usage examples of "permeability".
Psychological stress perturbs epidermal permeability barrier homeostasis: Implications for the pathogenesis of stress-associated skin disorders.
She could see data collected from the lunar material flickering over the softscreens, measurements of porosity and permeability, data from gas meters and pressure gauges and dynamometers and gravimeters.
It comes packaged with a special agent—a bradykinin agonist called 'Neurolax'—which increases the permeability of the blood-brain barrier by activating B2 receptors on the endothelial cells of the brain's capillaries.
We are doing some very exciting things—advanced cell-wall permeability studies in the carcinogenesis lab, several pilot grants on experimental drugs.
They wanted to define yield and ultimate strength, electrical conductivity and magnetic permeability at varying temperatures, currents, and frequencies.
Whats more, the contact has to be metallic and of a metal with just the magnetic permeability we use on our scaphes.
He knew precisely the strength of the magnetic fields and the permeabilities, reluctances, and so on, of all the materials involved.
We've all seen what they can do-frictionless surfaces, differential permeabilities, realignment of molecular structures.
We’ve all seen what they can do-frictionless surfaces, differential permeabilities, realignment of molecular structures.