What is "Air Permeability" - Definition & Explanation

The volume of air passing through a fabric under pressure.
The porosity of a fabric as estimated by the ease with which air passes through it. Air permeability measures the warmth of blankets, the air resistance of parachute cloth, the wind resistance of sailcloth, etc. as measured on standard testing equipment.
The permeablity, or the ease with which air passes through material. Air porous ness determines such factors as the wind resistance of sailcloth, the air resistance of parachute cloth, and the effectiveness of different kinds of air filtration media. It is also a measure of warmness, or coolness of a fabric.
The degree to which a fabric, coating or laminate allows air to pass through its construction.

Some other terms

Some more terms:

(woven fabric) - usually caused by an extra piece of yarn that is woven into fabric. It can also be caused by thick places in the yarn. Often is caused by fly waste being spun in yarn in the...
A general term for plain-weave fabrics of silk, cotton, or manufactured fiber having a wavy effect produced by weaving the warp of filling, but usually the filling, in a wavy line. An ondule reed is...
1. FIBRE. General term used for immature, undeveloped cotton fibres. May cause increased nep-piness on the fabric and also may cause uneven dyeing. May show up as undyed specks, due to poor dye...
A yarn composed of two or more single yarns twisted together. Many two-ply yarns are used in carpet. In cut-pile carpet, eg, saxony, plied yarns must be heat-set to prevent untwisting under traffic....
a) To allow textile materials (raw materials, fibres, slivers, yarns and fabrics) to come to hygroscopic equilibrium with the surrounding atmosphere, or with the standard atmosphere for testing...

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