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Extra info for Mass Transfer in Chemical Engineering Processes
2 Permeability The permeability coefficient, P , is defined as volume of the penetrant which passses per unit time through unit area of polymer having unit thickness, with a unit pressure diference across the system. The permeabilty depends on solubility coefficient, S , as well as the diffusion coefficient. Equation 9 expresses the permeabilty in terms of solubility and diffusivity, D , (Ashley, 1985). S (9) Typical units for P are (cm3 cm)/(s cm2 Pa) (those units×10-10 are defined as the barrer, the standard unit of P adopted by ASTM).
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