The moment of atoms, ions, or molecules from a region of higher concentration to regions of lower concentration is called

The moment of atoms, ions, or molecules from a region of higher concentration to regions of lower concentration is called diffusion.

Diffusion is actually defined as the passive movement of atoms, ions or molecules from a region of high concentration to a region of low concentration.

It took places until the concentration of the system becomes uniform throughout.

It is called diffusion.