Which of the following terms is not related to colloids?

Options

A. Brownian movement
B. Dialysis
C. Ultrafiltration
D. Wavelength

Answer

To determine which term is not related to colloids, we will analyze each of the provided options:

1. **Brownian Movement**:
- Brownian movement refers to the random motion of particles suspended in a fluid, resulting from collisions with the fast-moving molecules of the fluid. This phenomenon is characteristic of colloidal systems, where particles are dispersed in a medium.
- **Conclusion**: Brownian movement is related to colloids.

2. **Dialysis**:
- Dialysis is a process used to separate colloidal particles from dissolved ions or smaller molecules in a solution. It is a technique that exploits the size difference between colloidal particles and smaller solutes.
- **Conclusion**: Dialysis is related to colloids.

3. **Ultrafiltration**:
- Ultrafiltration is a filtration process that separates large colloidal particles from a fluid. It uses a membrane that allows smaller particles and solvents to pass through while retaining larger colloidal particles.
- **Conclusion**: Ultrafiltration is related to colloids.

4. **Wavelength**:
- Wavelength is a term used in the context of waves, particularly in physics and optics, to describe the distance between successive peaks of a wave. It does not have a direct relationship with colloidal systems or their properties.
- **Conclusion**: Wavelength is not related to colloids.

**Final Answer**: The term that is not related to colloids is **wavelength**.