1821 — Johann Josef Loschmidt (d. 1895), Austrian physicist and chemist, who first calculated the diameter of a molecule (1865) and determined the number of gas molecules contained in 1 cubic centimeter under normal conditions (Loschmidt's number).
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1821 — Johann Josef Loschmidt (d. 1895), Austrian physicist and chemist, who first calculated the diameter of a molecule (1865) and determined the number of gas molecules contained in 1 cubic centimeter under normal conditions (Loschmidt's number).