DIFFUSION is the movement of molecules from high to low concentration; passive, no energy needed; will continue until equilibrium is reached. Common everyday examples would be spraying air freshener, food coloring in water, candles or reed diffuser, and even passing gas!!
OSMOSIS is the movement of water (and only water) across the membrane, from a high to low concentration; passive, no energy needed. Three types: Isotonic, Hypertonic, Hypotonic.
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site on Passive Transport * interactive site on Diffusion* interactive animations
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