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Gas permeability: Property of materials to permeate gases under action of a driving force.

Gas separation membrane: Membrane that is used in the process of gas separation.

Gel fouling layer: Highly swollen fouling layer comprising a three-dimensional, possibly network, structure residing at the surface of a membrane.

Gel polarization: Formation of gel at the upstream of membrane in the process of separation.

Glassy membrane: Membrane made of silicate glass.