Search results
Results from the WOW.Com Content Network
Air permeability is a measure of the ability of air to pass through a fabric. [27] Air permeability is defined as "the volume of air in cubic centimetres (cm 3) which is passed through in one second through 100 cm 2 of the fabric at a pressure difference of 10 cm head of water", [28] also known as the Gurley unit.
Air permeability is the ability of a fabric to allow air to pass through it. While air permeable fabrics tend to have relatively high moisture vapor transmission, it is not necessary to be air permeable to be breathable. Moisture Vapor Transfer (MVT) in waterproof fabrics occurs by two processes:
Air permeability refers to the fabric's porosity or its ability to allow air to pass through it. A standardised testing procedure is crucial for various fabrics as it uncovers fundamental qualities such as warmth in blankets and air resistance in parachute cloth. [30]
The most common international unit for the MVTR is g/m 2 /day. In the USA, g/100in 2 /day is also in use, which is 0.064516 (approximately 1/15) of the value of g/m 2 /day units. Typical rates in aluminium foil laminates may be as low as 0.001 g/m 2 /day, whereas the rate in fabrics can measure up to several thousand g/m 2 /day. [citation needed]
A modern umbrella fabric has specific requirements for colour fastness to light, water and wet rubbing, and permeability. Serviceability in textiles or Performance is the ability of textile materials to withstand various conditions, environments, and hazards.
The SI unit for permeability is the square metre (m 2). A practical unit for permeability is the darcy (d), or more commonly the millidarcy (md) (1 d ≈ 10 −12 m 2). The name honors the French Engineer Henry Darcy who first described the flow of water through sand filters for potable water supply. Permeability values for most materials ...
Today, I purchased a $130 air fryer for $8. I got a $50 coupon for applying for a target red circle credit card and waited until black friday, when the item was on sale for around $58. I used my ...
The air permeability specific surface of a powder material is a single-parameter measurement of the fineness of the powder. The specific surface is derived from the resistance to flow of air (or some other gas) through a porous bed of the powder. The SI units are m 2 ·kg −1 ("mass specific surface") or m 2 ·m −3 ("volume specific surface").