What is this natural process of particles (gases, liquids, and solids – when melted) going from a higher concentration to a lower concentration?

What is this natural process of particles gases liquids and solids when melted going from a higher concentration to a lower concentration class=

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Answer:

This is by diffusion.

Explanation:

The slideshow describes what happens. Diffusion in liquids is slower than diffusion in gases because the particles in a liquid move more slowly. It happens faster if the temperature is increased