Biology·Organisation & maintenance · NSSCO 3.3.1
Diffusion
Narrated lesson · press play
How particles spread out on their own — from where they are crowded to where they are few — with no energy from the cell, and the four things that change how fast it happens.
What you'll learn in this lesson
By the end you should be able to (NSSCO Biology 3.3.1):
- Understand diffusion in terms of the movement of molecules
- Describe the process of diffusion
- State that the energy for diffusion comes from the kinetic energy of random movements of molecules and ions
- Describe the factors that influence diffusion — surface area, temperature, concentration gradients and distance
- Describe the importance of diffusion of gases and solutes
- Investigate diffusion (e.g. ammonia diffusing along a glass tube with red litmus paper)
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Hands-on lab
Run the ammonia diffusion experiment in 3D