Essential Chemistry for IGCSE - Particles And Purification (Section 5 - No. 18)

What does the term 'diffusion' describe?
The movement of particles from a region of high concentration to a region of low concentration.
The movement of particles from a region of low concentration to a region of high concentration.
The uniform mixing of particles throughout a substance.
The separation of particles based on their size.

Explanation

Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration.

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