Definition - What does Membrane mean?
A membrane is a selective semi-permeable material or barrier that prevents the transmission of certain substances, yet allows for the passage of others. Membranes are used as a roof covering to prevent water penetration, while allowing air passage. This aids in the prevention of water and carbon-induced corrosion.
Corrosionpedia explains Membrane
Membranes operate on the concept of pressure gradients, with substances flowing from a high-pressure area to a lower pressure area. They can be naturally occurring biological organisms or synthetically designed to address a specific application.