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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:

Mercerisation alters the chemical structure of the cotton fibre. The structure of the fibre changes from alpha-cellulose to beta-cellulose. Mercerising results in the swelling of the cell wall which...
This bast fibre comes from the Urena lobata plant. Wild, it grows 3 to 7 feet high and when cultivated can grow as tall as 13 feet. The fiber strands are cream coloured and have a wonderful luster....
a) A machine for dyeing fabric in rope form and in which the fabric is carried through a narrow throat by dye liquor circulated at high velocity. b) A machine for dyeing garments and in which the...
The amount, expressed as a percentage by mass, or linear polymer that is generally present in a crystalline form, the remainder of the polymer being present in an amorphous state. NOTE: There are...
A process in which Teflon is chemically bonded to a fabric at a molecular level to create a water repellent and stain resistant finish. It is highly effective in that it does not change the hand or...

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