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| Type | Properties | Examples |
|---|---|---|
| Solution | Small particles (less than 1 nm); transparent; does not settle; cannot be separated by filtration. | Salt solution. |
| Suspension | Large particles (more than 1000 nm); settles when undisturbed; separates by filtration; heterogeneous; scatters light. | Sand in water; mud. |
| Colloid | Moderate particles (1–1000 nm); particles remain evenly distributed; does not settle; scatters light. | Milk; butter. |
(Brass is a homogeneous alloy — a solution of metals.)
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