Question

1. define brownian motion.

Explanation:

Brownian motion is a physical phenomenon describing the random, erratic movement of small suspended particles (e.g., pollen, dust) in a fluid (liquid or gas). This movement arises from the constant, uneven bombardment of the particles by the invisible, thermally moving molecules of the surrounding fluid. It was first documented by botanist Robert Brown in 1827, and later explained by Albert Einstein using kinetic molecular theory.

Answer:

Brownian motion is the continuous, random, erratic movement of small particles suspended in a fluid (liquid or gas) resulting from their collision with the fast-moving molecules in the fluid.