semipermeable membranes

A semipermeable membrane is a barrier that allows certain molecules or ions to pass through while blocking others. Think of it as a selective filter—it permits the movement of specific substances based on size, charge, or other properties. This process is essential in biological systems, like cell membranes regulating nutrient intake and waste removal. In industrial applications, semipermeable membranes enable processes such as water purification and dialysis. They play a critical role in controlling what enters or exits a space, maintaining balance and proper function in both natural and engineered systems.