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What is the unit of coefficient of Permeability?

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What is the unit of coefficient of Permeability?

(a) s/m^2

(b) m^2/s

(c) m/s

(d) m^2

This question was posed to me in class test.

This key question is from Diffusivity and Permeability in Plastics topic in portion Thermoplastic Polymers Properties & Processing of Food Packaging Technology

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The correct option is (c) m/s

The explanation is: The unit of coefficient of Permeability is m^2. Permeability can be calculate by the formula- P=Qk/(AtΔP), where, P:Permeability, Q:Quantity of permeant, k:thickness,  A:area, t:time, ΔP:pressure drop across polymer.

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