Question

Вчём разница между диффузией и броуновским движением?

Answer 1

Difference between Diffusion and Brownian Motion

Diffusion and Brownian motion are both phenomena related to the movement of particles, but they have some key differences.

Diffusion refers to the process by which particles spread out from an area of high concentration to an area of low concentration. It is driven by the random motion of particles and does not require an external force. Diffusion occurs in various systems, such as gases, liquids, and solids, and it plays a crucial role in many biological and physical processes.

Brownian motion, on the other hand, specifically refers to the random motion of particles suspended in a fluid (usually a liquid or gas). It was first observed by the botanist Robert Brown in 1827 when he noticed the erratic movement of pollen grains in water. Brownian motion is caused by the constant collisions between the particles and the surrounding fluid molecules.

The key difference between diffusion and Brownian motion lies in their driving forces. Diffusion is driven by the concentration gradient, while Brownian motion is driven by random collisions with fluid molecules. Diffusion can occur in the absence of a fluid medium, such as in the diffusion of gases through a solid material, whereas Brownian motion requires a fluid medium for the particles to move randomly.

In summary: - Diffusion is the process of particles spreading out from an area of high concentration to an area of low concentration, driven by the concentration gradient. - **Brownian motion