The process of gases, vapours, or fluids permeating a solid's material membrane is known as permeation. The subsurface concentration is inversely correlated with Permeate rates. They are influenced by the material's mass diffusivity, inherent permeability, and membrane thickness in turn. A particular substance's permeability rises with temperature but is unaffected by pressure. When permeant molecules spread through a membrane or contact, permeation takes place. The permeant's concentration decreases as it diffuses through the interface, going from high to low. According to the sorption process, the permeant molecules at the interface can either be absorbed or desorbed.
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