* Solution: A homogeneous mixture where one substance (solute) dissolves completely into another (solvent). The particles are very small, typically individual atoms or molecules. Examples: sugar in water, salt in water.
* Colloid: A heterogeneous mixture where particles are intermediate in size between those in solutions and suspensions. These particles are large enough to scatter light (Tyndall effect), but small enough to remain suspended. Examples: milk, fog, paint.
* Suspension: A heterogeneous mixture where particles are large enough to settle out over time. These particles are visible to the naked eye and will scatter light. Examples: sand in water, muddy water.
In summary:
* Solutions have the smallest particle sizes.
* Colloids have intermediate particle sizes.
* Suspensions have the largest particle sizes.
