Jean Baptiste Perrin

French physicist Jean Baptiste Perrin (1870-1942) helped to prove that atoms and molecules exist, especially for his discovery of sedimentation equilibrium , an achievement that earned him the 1926 Nobel Prize in physics.

Born: 30 September 1870, Lille, France

Died: 17 April 1942, New York, NY, USA

Affiliation at the time of the award: Sorbonne University, Paris, France


During the 1880s atoms and molecules became important scientific concepts, but whether or not they actually had a physical existence was still a matter of dispute. Jean Perrin maintained that if molecules were real, particles blended into a liquid should not all sink to the bottom but should distribute themselves throughout the liquid. In 1908 he could substantiate this through experimentation.

He also substantiated Albert Einstein’s theory that Brownian motion – the random movement of small particles in a liquid – was due to collisions between the particles and molecules in the liquid.

Love All.

Tuesday is for my Science studies and to read about the great human whose initial efforts made it possible for us to live with vast knowledge available to all and going through new discoveries.

Compiled by : ram H singhal