Asphalt driveways are typically less expensive than concrete, costing a minimum of about $2.50 per square foot. An asphalt driveway might last just 20 years; however, while a concrete driveway can last more than 30.
Semipermeable membrane. The diffusion of water through a selectively permeable membrane is called osmosis.This allows only certain particles to go through including water and leaving behind the solutes including salt and other contaminants. In the process of reverse osmosis, thin film composite membranes (TFC or TFM) are used.
The cell membrane is a severely permeable membrane, and therefore it regulates. the passage of substances into and out of the cell. Osmosis: The diffusion of water (or some other solvent) across a selective permeable. membrane; water diffuses to a hypertonic area. When water enters or leaves the cell it. is usually accomplished by osmosis.