Jean Rey (c. 1583 – c. 1645) or (in English) John Rey was a French physician and chemist.
He discovered that the weight of lead and tin increases when they are calcinated, and attributed this phenomenon to the weight of air, which he believed to become denser when heated (Essays, 1630). He explained the greater weight of calcinated lead and tin by supposing that calcination involves the incorporation of air in the metal. This hypothesis would later be confirmed by Lavoisier, over a century later in 1789.
- "Un héritier des chercheurs de la Renaissance : Jean Rey médecin au Bugue" (PDF). Bulletin de la Société historique et archéologique du Périgord (in French): 229–238. 1975. Archived from the original (PDF) on 18 September 2018.
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