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n. - A hypothetical substance once believed to be present in all combustible materials and to be released during burning.

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Usage examples (35)
  • Does this mean a science fiction story cannot be set in a fantasy universe where the theory of phlogiston is true?
  • Stahl, the author of this theory, asserted that there is a principle of inflammability, to which he gave the name phlogiston, having the quality of uniting with substances.
  • With precipitated indigo, the orpiment doesn't create changes, Bergman continued, because the union of phlogiston is too strong — you need the heat and the alkali to...
  • It is the so-called phlogiston-theory first proposed by the chemist Stahl (1660-1734).
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