In chemistry, mixtures are classified based on their particle size. A Colloidal Solution (or simply a Colloid) is an intermediate mixture — its particles are larger than a true solution but smaller than a suspension.
Particle Size: 1–1000 nm.
Tyndall Effect: Light scattering — key property of colloids.
Dispersed Phase: The substance scattered (e.g., fat in milk).
Dispersion Medium: The medium (e.g., water in milk).
| Type | Particle Size | Example |
|---|---|---|
| True Solution | < 1 nm | Salt water, Sugar water |
| Colloid | 1–1000 nm | Milk, Blood, Fog, Starch solution |
| Suspension | > 1000 nm | Muddy water, Chalk in water |
A colloidal solution is a mixture where tiny particles (1–1000 nm) are dispersed in a medium. They do not settle and show the Tyndall effect.
The Tyndall effect is the scattering of a beam of light by colloidal particles, making the path of light visible.
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