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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:

Results when all or some of the needles on circular knitting fail to function and fabric either falls off the machine or design is completely disrupted or destroyed. Many knitting needles are broken...
Can be either a cotton or wool fabric, woven in a plain open weave, similar to cheesecloth, and dyed in the piece. Cotton bunting is often woven with plied yarns. Wool bunting is woven with worsted...
Grommets and eyelets are metal, plastic, or rubber rings that are inserted into a hole made through another material. They may be used to reinforce the hole, to shield something from the sharp edges...
May be a bobbin or needlepoint lace usually on a machine made ground. Sometimes designs are appliquéd on the ground. As Brussels Belgium is important in the history of lace-making, many different...
A process of passing cloths between one or more rollers (or calenders), usually under carefully controlled heat and pressure, to produce a variety of surface effects or textures in a fabric such as...

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