Brownian motion

The Annus Mirabilis in Physics – Albert Einstein and the Year 1905

The Annus Mirabilis in Physics – Albert Einstein and the Year 1905

Have you ever heard of the “Annus Mirabilis” (in German “Wunderjahr“) of physics? 1905 was this Annus Mirabilis, this year of wonders or extraordinary year. History considers 1905 as the year with the most outstanding and influential papers ever published by famous physicist Albert Einstein in the   the Annalen der Physik scientific journal. These four articles contributed substantially to the foundation of modern physics and changed views on space, time, and matter.…
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Jean Baptiste Perrin and the Brownian Motion

Jean Baptiste Perrin and the Brownian Motion

On September 30, 1870, French physicist Jean Baptiste Perrin was born. In his studies of the Brownian motion of minute particles suspended in liquids, Perrin verified Albert Einstein’s explanation of this phenomenon and thereby confirmed the atomic nature of matter. In 1897, Jean Baptiste Perrin earned his PhD and was appointed lecturer at Sorbonne, Paris. Perrin was announced professor at the university in 1910 and held the position until the German occupation…
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