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Jean Baptiste Perrin
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<p>Jean Baptiste Perrin <a href="/facts/Foreign_Member_of_the_Royal_Society/cWs8TdC5">ForMemRS</a> (30 September 1870 – 17 April 1942) was a French physicist who, in his studies of the <a href="/facts/Brownian_motion/Th0g0wkr">Brownian motion</a> of minute particles suspended in liquids (<a href="/facts/Sedimentation_equilibrium/oPDxhgnl">sedimentation equilibrium</a>), verified <a href="/facts/Albert_Einstein/CNTet8qu">Albert Einstein</a>'s explanation of this phenomenon and thereby confirmed the atomic nature of <a href="/facts/Matter/osyc04UN">matter</a>. For this achievement he was honoured with the <a href="/facts/Nobel_Prize_for_Physics/o6w1nCbr">Nobel Prize in Physics</a> in 1926. </p>