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Cambridge IGCSE chemistry

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  1. States of matter
    States of matter
    3 Topics
  2. Changing state
    5 Topics
  3. Diffusion
    4 Topics
  4. Experimental techniques
    Taking measurements
    4 Topics
  5. Separation and purification
    4 Topics
  6. Chromatography
    2 Topics
Cambridge IGCSE chemistry Diffusion What is diffusion
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Lesson 3, Topic 1
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What is diffusion

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Diffusion is the spreading of one substance into another due to the random motion of the particles

  • Diffusion is explained by the kinetic particle theory. Particles collide randomly with each other leading to complete mixing of the particles

  • Diffusion in gases is faster than diffusion in liquids because the particles in gases move faster

  • Diffusion does not happen in solids because the particles are fixed in position 

  • The overall movement of particles is from where they are more concentrated to where they are less concentrated