Pronunciation: [d͡ʒˈiːn pˈɛɹɪn] (IPA) 
Jean Perrin was a French physicist who won the Nobel Prize in Physics in 1926 for his work on Brownian motion. The spelling of his name in French is /ʒɑ̃pɛʁɛ̃/. The "j" is pronounced like the "s" in "measure", the "a" has an open sound similar to the "a" in "artist", and the "ɛ" is pronounced like the "e" in "pet". The final "in" is nasalized and pronounced with the tongue in the bottom of the mouth.
Jean Perrin was a French physicist and Nobel laureate known for his significant contributions to the study of the properties of matter and the structure of atoms. Born on September 30, 1870, in Lille, France, Perrin conducted pioneering research in areas such as molecular vibrations, Brownian motion, and the nature of light, further advancing our understanding of fundamental physics.
Perrin’s most renowned work involved his experimental confirmation of Albert Einstein's theory explaining Brownian motion as the result of random molecular collisions. His meticulous measurements of the motion of small particles suspended in fluid solidified the scientific community's acceptance of the existence of atoms and molecules, validating the kinetic theory of gases. This groundbreaking work earned Perrin the Nobel Prize in Physics in 1926, recognizing his precise measurements and significant experiments on colloidal solutions.
Throughout his career, Perrin also conducted research on the photoelectric effect and diffraction of X-rays, giving valuable insights into the atomic structure of matter. His experiments provided supporting evidence for the wave-particle duality of light and its fundamental nature. Furthermore, he made key contributions to the determination of Avogadro's number, which measures the number of atoms per molecule of a substance.
Jean Perrin's meticulous and groundbreaking research, particularly on Brownian motion, atoms, and Avogadro's number, significantly advanced our understanding of the physical properties of matter. His contributions to the field of physics continue to shape our knowledge and inspire future generations of scientists.
