Diffusion
Biology: Cambridge International GCSE Supplement, topic 3.1.1
Diffusion
The random movement of particles through a gas or liquid from high concentration to a low concentration.
Perfume
- When you spray perfume, the smell diffuses across the room from the high concentration (where you just sprayed it) to low concentration (the other side of the room).
Energy
- The energy for diffusion comes from the kinetic energy of movement of ions and molecules.
- This movement is random.
Movement
- Some substances move out of and into cells by diffusion.
- The diffusion happens through the cell membrane.
Test yourself on Diffusion
Which of the following are true of diffusion?
Which of the following is a waste product removed by diffusion?