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This lesson covers diffusion — one of the key processes by which substances move in and out of cells — as required by the AQA GCSE Combined Science Trilogy specification (8464). You need to understand the definition, factors affecting the rate of diffusion and examples of diffusion in living organisms.
Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration, down a concentration gradient.
Key points:
Exam Tip: Always refer to the "net movement" of particles. Individual particles move randomly in all directions, but the overall (net) movement is from high to low concentration. The word "net" is important for full marks.
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