This effect is particularly pronounced for charged species, which have even lower permeability coefficients than neutral polar molecules.

This also depends on the membrane permeability coefficient K for the solute in question.

The gas permeability coefficient of the cyanobacterial gas vesicle wall.

The permeability coefficient can be calculated in Barrers.

The following table gives examples of the calculated permeability coefficient of certain gases through a silicon membrane.

So dialyzer efficiency is usually expressed as the KA - the product of permeability coefficient and area.

Most polar molecules have low solubility in the hydrocarbon core of a lipid bilayer and consequently have low permeability coefficients across the bilayer.