Diffusion and Brownian Motion

Proof of Particle Theory of Matter – Diffusion

In SPM, you need to know

1. diffusion is one of the proofs of the particle theory of matter.
2. the definition of diffusion.
3. diffusion in solid, liquid and gas
4. factors that affect the rate of diffusion and the related experiments.

What is Diffusion?

1. Diffusion is a process of spreading a substance from a region of high concentration to a region of low concentration.
2. It occurs when the particles of the substance move through the space between the particles of another substance.
3. Figure below shows how the bromine particles diffuse into the air.
4. Diffusion occurs in solid, liquid and gas.
5. The rate of diffusion is highest in gas and lowest in solid.
6. Diffusion is proof of the particle theory of matter.

MUST KNOW!

• The rate of diffusion is highest in gas and lowest in solid.
• Diffusion is the proof of the particle theory of matter.