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.
Diffusion of only WATER molecules through the globular protein channels or pores of the cell membrane (i.e. cell membrane) from a region of higher concentration of water to a lower conc. Of water until equilibrium of water is reach, in an attempt to dilute a particular solute.