The transmission of water is essential as clothing comfort is concerned. Human body produces heat in the form of perspirations during its activity and is used to evaporate perspiration, resulting in the dissipation of heat and cooling of the body. However, if water vapor cannot escape to atmosphere then RH inside clothing increases, causing discomfort. Hence, knowledge of water vapor transmission is necessary. In this paper, we have tried to simulate the information about the water vapor permeability and factors influencing it.

1. Water Vapor Transmission

Water vapor transmission is essential in determining breathability which is ability of clothing to allow water vapor to penetrate.

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

Water vapor can be transferred by

1.      Diffusion of water vapors through layers

2.      Absorption, transmission and desorption of water vapor by fibers

3.      Adsorption and migration of water vapor along fiber surface

4.      Transmission of water vapor by forced convection



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