The transmission of water is essentialas clothing comfort is concerned. Human body produces heat in the form ofperspirations during its activity and is used to evaporate perspiration,resulting in the dissipation of heat and cooling of the body. However, if watervapor cannot escape to atmosphere then RH inside clothing increases, causingdiscomfort. Hence, knowledge of water vapor transmission is necessary. In thispaper, we have tried to simulate the information about the water vaporpermeability and factors influencing it.

1.Water Vapor Transmission

Watervapor transmission is essential in determining breathability which is abilityof clothing to allow water vapor to penetrate.

Watervapor permeability is defined as 'fabric's ability to transport water vaporfrom skin surface through fabric to external environment'.[1]

Watervapor can be transferred by

1.     Diffusion of water vaporsthrough layers

2.     Absorption, transmission anddesorption of water vapor by fibers

3.     Adsorption and migration ofwater vapor along fiber surface

4.     Transmission of water vapor byforced convection



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