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Diffusion and Osmosis Lab Hemi Ryu 11/21/05 Per. 4B Background Information: All atoms and molecules possess kinetic energy due to their constant motion. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration and is caused by the atoms' kinetic energy. Osmosis is the diffusion of water through a selectively permeable membrane, a membrane that allows the diffusion of only selected solutes and water. During osmosis, water moves from a region of higher water potential to a region of lower water potential until equilibrium is reached. Water potential is the measure of free energy of water in a solution. Cells have ways to move ions or molecules incapable of diffusion and osmosis into and out of themselves. This process is called active transport, where carrier proteins use energy from ATP to move substances across the cell membrane against a concentration gradient, from a region of lower concentration...

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