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.
Osmosis is the net diffusion of water across a membrane. Aquaporins are proteins that form channels in the lipid bi-layer for the polar water molecules to diffuse through. There will be a net diffusion of both compartments leading to diffusion equilibrium with no change in volume in either compartment if the compartments are separated by a membrane that is permeable to both a solute and water.