| Diffusion | Osmosis |
| $(1)$ Diffusion is the passive movement of particles, ions, and molecules along the concentration gradient. | $(1)$ Osmosis is the process in which the diffusion of a solvent (water) occurs across a semi-permeable membrane. |
| $(2)$ It can occur in solids, liquids, and gases. | $(2)$ It occurs in the liquid medium. |
| $(3)$ It does not require a semi-permeable membrane. | $(3)$ It requires a semi-permeable membrane. |
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