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Be clear that it is generally agreed that "permeance" is the same as "transmission rate", so is not the same as permeability. If you meet "permeance" out of context, you have to be very careful because sometimes they mean transmission rate and sometimes permeability. Be clear about what units you are using. Permeability is a nightmare of units.
Permeability indicates the degree to which another substance can enter a given material, generally measured for specific conditions such as pressure, time, and temperature. Permeance is closely related to permeability, but it refers to the extent of penetration of a specific object with a given thickness by a liquid or a gas.