Question

1. what is diffusion?

Explanation:

Diffusion is the movement of particles (atoms, molecules, ions) from an area of higher concentration to an area of lower concentration, driven by the random motion of particles (Brownian motion), until equilibrium (equal concentration) is reached. It occurs in gases, liquids, and solids (e.g., perfume spreading in air, ink mixing in water).

Answer:

Diffusion is the net movement of particles (atoms, molecules, ions) from a region of higher concentration to a region of lower concentration, driven by random particle motion, until concentration equilibrium is achieved.