Chemistry / Chem 1291 · Atom · ~20 seconds
Diffusion
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Diffusion is the spread of gas molecules from a region of higher concentration to a region of lower concentration through random motion.
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An opened perfume bottle's scent gradually spreads through a still room as its molecules diffuse from where they are concentrated.
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No molecule moves toward "low concentration" on purpose — the net drift toward it emerges from millions of random directions.