Diffusion
Science: KS3, topic 1.1.7
Diffusion
Substances can enter and leave cells in a process called diffusion.
The role of diffusion
- It is important that substances can move both into and out of cells.
- We want oxygen to diffuse into cells because it is needed for life.
- We want carbon dioxide to diffuse out of cells as it is a waste product.
Diffusion
- Some substances move in and out of cells by a process called diffusion.
- This is where particles move from an area of high concentration to an area of low concentration.
- In the same way, air freshener particles will spread around a room if sprayed into one corner.
Test yourself on Diffusion
Which of the following best describes diffusion?
Select the correct statement in each pair
A room has a high concentration of perfume near a closed window and a low concentration near an open door. Which way will the perfume particles diffuse?
What is the same about air freshener spreading in a room and skunk spray smell reaching other people?