PEAZIT Aha card
Go straight to resources ↓Diffusion: random motion produces net flow
Particles move randomly in both directions. More particles usually leave the region with more particles per equal volume. Net diffusion follows the concentration gradient until dynamic equilibrium.
| Observation | What it means |
|---|---|
| More particles on the left | more crossings to the right |
| Equal concentrations | average opposing flows balance |
One worked example
- 8 particles left, 2 right in a modelThe volumes are equal.
- Crossings both waysParticles do not stop moving.
- Net flow to the rightThe right-hand count increases on average.
Watch out: Equilibrium does not mean particles stop. Electric fields also affect charged particles.
Goal, prerequisites and card origin
What you will learn: Find the direction of net particle movement.
What you need first: Concentration as amount per volume.
An original PEAZIT working card. Independent expert review and effectiveness testing have not yet taken place. · v1
Reference for the underlying principle ↗Show connections
Particles move randomly in both directions. More particles usually leave the region with more particles per equal volume. Net diffusion follows the concentration gradient until dynamic equilibrium.