Jean Baptiste Perrin
French physicist (1870-1942) · France · Scientists · Died at 71
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Something wrong?He watched dust motes dance in water and proved atoms were real. Perrin's experiments on Brownian motion turned Einstein's equations into observable fact - the kind of work that closes an argument centuries old.
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Jean Baptiste Perrin was born in France on 30 September 1870. He built his career studying something most scientists had taken for granted: whether matter was truly made of atoms, or if the atomic hypothesis was just a useful fiction. Focusing on Brownian motion - the jittery wandering of tiny particles suspended in liquid - he designed painstaking experiments on sedimentation equilibrium that matched Einstein's theoretical predictions with startling precision. That concordance settled the question: atoms existed, and you could measure their effects. The Nobel Prize in Physics followed in 1926. He died on 17 April 1942.
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