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The Pfeffer cell determines the osmotic pressure of a solution.
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The Pfeffer cell was composed of a porous earthenware container, with a copper ferrocyanide precipitate, connected to a manometer.[7]
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Osmotic pressure of dissolved sucrose (german: "Rohrzucker") obtained by Pfeffer (Table 9 from "Osmotische Untersuchungen", 1877)