When a person can smell the perfume whose molecules are released from many feet away, this phenomenon illustrates diffusion.
Diffusion is the process in which the molecules of a substance move from its region of higher concentration to the region of lower concentration. This movement of particles from higher concentration to lower concentration is termed as moving down the concentration gradient. It is a passive process. No energy is applied for the movement of particles.
Molecules are the group of atoms combined together with some force or bonds, that represent a chemical compound. Molecules have their specific physical and chemical properties.
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