Diffusion. AQA GCSE Additional science. biology2

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Diffusion 'Diffuison' is simple. its just the gradual movement of particles from a place where there's lots of them, to a place where theres not many of them. 'Diffusion is the passive movement of particles from an area of high concentration to an area of low concentration' Diffusion happens in liquids and gases- because particles in these substances can move about freely. The simplest type is when different gases diffuse through each other, (like when the smell of perfume diffuses through a room) The bigger the difference in concentration,  the faster the rate of diffusion.   (http://upload.wikimedia.org/wikipedia/commons/thumb/1/12/Diffusion.svg/220px-Diffusion.svg.png) Cell Membranes: They hold the cell




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