Jean Perrin

Jean Perrin was a French physicist who made significant contributions to understanding the atomic nature of matter. He provided strong experimental evidence that atoms and molecules are real, not just theoretical ideas, through experiments involving the movement of particles in fluids—known as Brownian motion. His work helped confirm the existence of atoms and measured their size, supporting the atomic model of matter. Perrin's discoveries earned him the Nobel Prize in Physics in 1926 and played a vital role in establishing modern atomic theory.