a) diffusion, solubility
b) permeance, solubility
c) diffusion, permeance
d) transmittivity, solubility
Answer: a
Explanation: Permeability is calculated using Diffusion and Solubility. Permeability is the product of diffusion and solubility. When a gas/vapour passes through the plastic film, it solubilizes first and then diffuses through the film.
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