Physics › Section H · Fluids › Topic H.8
Diffusion, osmosis, and transport
Even in perfectly still water, molecules wander. Their random thermal motion spreads dissolved substances, moves water across cell membranes and, over small distances, feeds every cell in your body.
In this topic
- Molecules on a random walk
- How far does diffusion go?
- What sets the diffusion constant
- Worked example: oxygen in water
- Why size matters for living things
- The direction and rate of diffusion
- Membranes and osmosis
- Osmotic pressure
- Worked example: an osmotic column
- Reverse osmosis and active transport
- Common mistakes to avoid
- Key takeaways
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