Permeability

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permeability

[‚pər·mē·ə′bil·əd·ē]
(electromagnetism)
A factor, characteristic of a material, that is proportional to the magnetic induction produced in a material divided by the magnetic field strength; it is a tensor when these quantities are not parallel. Also known as magnetic permeability.
(fluid mechanics)
The ability of a membrane or other material to permit a substance to pass through it.
Quantitatively, the amount of substance which passes through the material under given conditions.
(geology)
The capacity of a porous rock, soil, or sediment for transmitting a fluid without damage to the structure of the medium. Also known as conductivity; perviousness.
(naval architecture)
The percentage of a given space in a ship that can be occupied by water.

Permeability

A measure of the ability of a material, such as rock or soil, to transmit fluids or air through it.

permeability

1. The property of a porous material which permits the passage of water vapor through it. Also See permeance.
2. The property of soil, rock, or mantle which permits water to flow through it.
References in periodicals archive ?
The relative helium permeabilities of the TX60A blend with various DCP concentrations prepared by two different blending sequences are shown in Fig.
w], m/s) of the 5 soils was first estimated from intrinsic permeabilities obtained in the gas flow experiments using Eqn 8:
It is clear that the 5 soils tested exhibited a relatively wide range of permeabilities, with P-Q curve slopes ranging from 3.
A simple correlation between permeabilities and mercury capillary pressure.
If permeabilities over 120 are used in synthetic sands, the surface finish of the castings may not be acceptable.
The apparatus described allows for the quick determination of paint film permeabilities.
The oxygen permeabilities and selectivities can be calculated for this hypothetical system for both cases using the simple expression of resistances in series (Eq 6).
The calculated permeabilities covered a factor of two thousand, from a low for Barex and natural gas of 0.
The basic procedure can be easily extended to handle materials with both higher and lower permeabilities than those already tested.
If the objective is to obtain tires with different permeabilities of the innerliner compounds and the same rate of pressure loss (k), then K must be constant.
The effects of draw ratio and draw temperature on neat polymer permeabilities and blend permeabilities are shown in Figs.