7th Grade Life Science
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Osmosis and Diffusion

Diffusion

  
Diffusion is the movement of molecules from a crowded area to a less crowed area.

In cells molecules move through tiny holes in the cell membrane. Only molecules small enough to fit through the holes are let in.

Osmosis

Osmosis is the diffusion of water molecules through a membrane.

Click here for an animation of osmosis.  Then click on the play buttons.

We did the Egg Lab to help understand osmosis