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Diffusion

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Everybody gets better if they keep at it.


Ted Williams

 

Molecules are in constant motion

    • Gases - very quickly
    • Liquids - quickly, but not as quickly as gases
    • Solids - vibrate in place

Diffusion

    • Movement of molecules
    • From an area of high concentration to an area of low concentration
      • Many molecules of one kind in the same space
    • Into available space
    • "Spread out"
    • Happens naturally

Passive Transport

    • Movement of molecules through a selectively permeable membrane .
      • Allows some, but not all molecules through
      • Selects" molecules allow through

Osmosis

    • Special type of diffusion
    • Diffusion of water through a selectively permeable membrane