What is Brownian motion and diffusion. Explain how these phenomena prove the reality of the existence of molecules and illustrate

What is Brownian motion and diffusion. Explain how these phenomena prove the reality of the existence of molecules and illustrate the provisions of the atomic-molecular doctrine.

The disordered movement of particles of matter suspended in a liquid or gas, which occurs under the influence of collisions of these particles with molecules of the environment, is called Brownian motion.
Diffusion is the spontaneous spread of molecules of one substance between the molecules of another.

Explain how these phenomena prove the reality of the existence of molecules and illustrate the provisions of the atomic-molecular doctrine.
The movement of watercolor paint particles in a few drops of water is Brownian movement and is evidence of the existence of molecules and their constant movement. The presence of molecules can be judged by the impact they produce, causing the paint particles to move.
The spread of odor, sprayed deodorant in the room, or the disappearance of raspberry stains, clearly visible to the naked eye, when several crystals of potassium permanganate (potassium permanganate) dissolve and a completely homogeneous solution is obtained over time are examples of the diffusion of gaseous and liquid substances – proof of the presence of particles of a substance and their constant movement.

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