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You can easily find all the videos that you need on my website, along with other great revision resources. Check it out www.freesciencelessons.co.uk In this video, we look at diffusion. I take you through the concept of diffusion and then we look at three factors that affect the rate of diffusion.

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Particles (molecules and ions) in a liquid and a gas move continuously. Because of this movement, particles will spread themselves evenly throughout a liquid or a gas.

If there is a situation where particles of a substance are in a higher concentration, they will move from this region to where they are in a lower concentration. This is called .

It is important to remember that the particles:

will move in both directions, but there will be a movement from high to low concentration

will end up evenly spread throughout the liquid or gas, but will continue to move

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BBC Bitesize - GCSE Combined Science - Transport in cells - AQA - Revision 1

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Particles (molecules and ions) in a liquid and a gas move continuously. Because of this movement, particles will spread themselves evenly throughout a liquid or a gas. If there is a situation where particles of a substance are in a higher concentration, they will move from this region to where they are in a lower concentration.

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Lesson Presentation - Diffusion Practical

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https://www.youtube.com/watch?v=eGCQwvIndMU

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Animation: How Diffusion Works (See related pages)