Diffusion:

• Process: Diffusion is the spontaneous movement of particles from an area of high concentration to an area of low concentration. This occurs due to the random thermal motion of the particles, driven by their natural tendency to achieve a state of uniform equilibrium.

• Outcome: In diffusion, the total number of particles remains constant, but their distribution becomes more even over time. Imagine adding a drop of food coloring to a glass of water. The color molecules will gradually diffuse throughout the water until they are evenly distributed, without any change in the total number of molecules.

Dilution:

• Process: Dilution involves adding a solvent (like water) to a solution to decrease the concentration of a solute (like salt). This process often involves physical mixing to ensure even distribution of the solvent and solute molecules.

• Outcome: In dilution, the total number of solute particles decreases, while the total volume of the solution increases. It's like adding more water to a bowl of soup with a fixed amount of noodles. While the volume of soup increases, the number of noodles remains the same, making the soup less concentrated.