* Movement down the concentration gradient: Both processes move substances from an area of high concentration to an area of low concentration, aiming to reach equilibrium.
* No energy required: Neither osmosis nor diffusion requires the cell to expend energy to move substances. The movement is driven by the inherent kinetic energy of molecules.
* Increase entropy: Both processes increase the overall entropy (disorder) of the system.
Key differences:
* What's moving: Osmosis specifically refers to the movement of water across a semipermeable membrane, while diffusion applies to the movement of any molecule (like gases, ions, or even larger molecules).
* Membrane: Osmosis requires a semipermeable membrane that allows water to pass through but restricts other molecules. Diffusion can occur across both permeable and semipermeable membranes, and even in open spaces.
In essence, osmosis is a special case of diffusion that focuses on the movement of water. They both follow the same fundamental principle of moving substances from high to low concentration.
