What Is the Difference Between Osmosis and Diffusion?
Osmosis is a type of diffusion but only for water through membranes. Diffusion is just molecules spreading out.
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Osmosis is the movement of water through a semi-permeable membrane from low to high solute concentration, while diffusion is the movement of particles from high to low concentration without a membrane.
Osmosis needs a membrane and water; diffusion is anything going from crowded to less crowded.
Osmosis specifically involves water and needs a semi-permeable membrane. Diffusion is broader, involving any type of molecule moving from high to low concentration.
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