1. Diffusion

2. Moving particles… gas in a gas
Why can someone on the other side of the room smell the aerosol?
Why does the smell disappear?

3. Moving particles… gas in a gas
Damp litmus paper
Boiling tube
Cotton wool dampened with ammonia
Heat proof mat

4. What are the particles doing?
This process of spreading out is called diffusion

5. Diffusion in Gases

6. Moving particles… solid in a liquid
Potassium permanganate crystals

7. Moving particles… is it gravity?
Potassium Permanganate
Jelly
Potassium Permanganate

8. Moving particles… Liquid in a solid
Coloured gel
Clear gel

9. Moving particles… liquid in a liquid
What happens when you add diluting juice or food colouring to water?

11. Predication? Why do you think that?
Gummy Bear in Water
Predication? Why do you think that?

12. Diffusion Interactive

13. Diffusion Animation