Justus von Liebig did not invent the condenser. In the words of Wikipedia, "The earliest laboratory condenser, a Gegenstromkühler (counter–flow condenser), was invented in 1771 by the Swedish–German chemist Christian Weigel. By the mid–19th century, German chemist Justus von Liebig would provide his own improvements on the preceding designs of Weigel and Johann Friedrich August Göttling, with the device becoming known as the Liebig condenser."
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