History of Science
Quintessence refers to the fifth element that ancient philosophers believed was essential to the composition of the universe, beyond the four classical elements of earth, water, air, and fire. It was thought to be a pure, celestial substance that filled the universe and was associated with the heavenly bodies. This concept played a crucial role in both alchemical theories and early chemistry, influencing ideas about the nature of matter and the search for the philosopher's stone.
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