Multiple choice

When molecules gradually spread out it is called

  1. diffraction

  2. diffusion

  3. confusion

  4. suffusion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. This gradual spreading continues until the molecules are evenly distributed. Other options like diffraction refer to the bending of waves, not the movement of particles.

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