What is Diffusion?

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Diffusion occurs when particles spread. They move from a region where they are in high concentration to a region where they are in low concentration until they are equally dispersed. Diffusion happens when the particles are free to move. This is true in gases and for particles dissolved in solutions.

During dissolving, particles of solvent collide with particles of solute. They surround the particles of solute, gradually moving them away until the particles are evenly spread through the solvent.

At the end of viewing this video, you should be able to:

  • What diffusion is
  • How it works
  • How it applies to cell membranes
  • The 3 factors that affect the rate of diffusion (concentration gradient, temperature, surface area)

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