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Osmosis and reverse osmosis are two fundamental processes that play an important role in the movement of solvents across semipermeable membranes. Although both rely on the principle of diffusion through a selectively permeable barrier, they operate in opposite directions and are driven by different forces. To understand their differences, it is important to first analyze the natural phenomenon of osmosis and then consider how reverse osmosis is engineered for applications, particularly in waste treatment, water purification, and solid waste management systems. Osmosis is a natural, spontaneous process where water molecules move across a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration. The driving force behind osmosis is the difference in chemical potential or osmotic pressure between the two sides of the membrane. In essence, water flows in the direction that equalizes solute concentration, thereby creating equilibrium across the membrane. For example, when a cell is placed in a saline solution, water molecules tend to move out of or into the cell depending on whether the external solution is hypertonic or hypotonic relative to the cell interior. The semipermeable membrane in this context allows water molecules to pass freely while restricting larger solute particles. Osmosis is ___ ______ ______ _________ _____.
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