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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:

A treatment of cotton yarn or fabric to increase its luster. Its affinity for dyes is also enhanced. In the process, the material is immersed under tension in a sodium hydroxide (caustic soda)...
A loose, zippered jacket with fitted waist and cuffs, resembling those worn by American bomber pilots in World War II. Can be made from nylon, woven blends or leather. Usually has a fur or pile...
A manufactured fiber composed of regenerated cellulose. Lyocell has a similar hand and drape as rayon, but is stronger, more durable, and in many cases machine washable. It has a subtle luster and is...
A bast fiber obtained from the Hibiscus cannabinus plant. The stalk of this plant varies in height from 8 to 12 feet and is about half an inch in diameter. Kenaf is mostly produced in India and...
A length of yarn on the surface of a woven fabric between two consecutive intersections of the yarn with the yarns woven at right angles to it. NOTE: A float is designated by the number of threads...

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