Biology / Bio 0335 · Atom · ~20 seconds
Diffusion
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Diffusion is the passive movement of a substance from higher to lower concentration until the concentration is equal throughout a space.
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Ammonia vapor released from a bottle spreads outward through a room, thinning as it moves from its point of highest concentration.
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Diffusion needs no cellular energy — the concentration gradient itself, not the cell, drives the movement.