Hey guys i want to correct u that the particle of colloidal is not stable at any moment because of it's constant zig zag motion and that's the reason it never settel down.i hope now ur confusion is clear..

Stability of Colloidal Particles
Colloidal particles are small, dispersed particles that remain suspended in a continuous medium. Their stability is influenced by several key factors:
1. Brownian Motion
- The constant random motion of colloidal particles, known as Brownian motion, helps them remain suspended and prevents them from settling due to gravity.
2. Electrostatic Repulsion
- Colloidal particles often carry an electrical charge on their surfaces. This charge causes like charges to repel each other, preventing the particles from aggregating and settling.
3. Steric Stabilization
- In some colloids, stabilizing agents or surfactants are added that create a protective layer around the particles. This layer prevents aggregation by physically hindering the approach of nearby particles.
4. Solvation Shell
- Colloidal particles can attract solvent molecules, forming a solvation shell. This shell helps maintain distance between particles, further preventing aggregation.
5. Size of Particles
- The small size of colloidal particles increases the surface area-to-volume ratio, which enhances stability. Smaller particles experience greater forces from the surrounding medium, aiding in their suspension.
6. pH and Ionic Strength
- The stability of colloidal systems can be affected by the pH and ionic strength of the medium. Adjusting these factors can either enhance or decrease the stability by altering the charge on the particles or the screening effects of ions.
In summary, the stability of colloidal particles arises from a combination of physical phenomena and chemical interactions, which work together to keep the particles from aggregating or settling out of the dispersion.