Biology formulas

Diffusion is the spreading out of particles from an area of high concentration to an area of low concentration

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Diffusion

  • Diffusion is the spreading out of particles from an area of high concentration to an area of low concentration
  • It's the gradual movement of particles from places where there's lots of them to places where there's fewer
  • Spreading out
  • Happens in both solutions and gases becasue the particles move about randomly
  • The simplest is when gaes diffuses through each other, e.g perfume
  • Dissolved substances can move in and out of cells by diffusion
  • The cell membrane lets them in and out and still holds the cell together
  • Only very small molecules dissolve through the membranes
  • Big molecules like starch and proteins can't fit through the membrane
  • The particles flow through the cell membrane to an area where there's less of them
  • They move randomly and so go both ways but if there are a lot more on one side of the membrane there's an overall movement from that side
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