Definition: this is the unequal distribution of ions across a cell membrane. example: the diffusion of oxygen into a cell across the cell membrane, from and area of high concentration to an area of lower concentration.

This is the definition and example of Osmosis.

Explanation: Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a region of high concentration of solvent to a less concentration of solvent, thus making the concentrations on each side of the membrane equal.

The cell membrane is also a selectively permeable membrane which allows only certain substances to pass through it. Mostly molecules move from a side where their concentration is high to a side where their concentration is less to make the concentration equal on both sides.

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