Jean Rey (physician)
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Jean Rey (c. 1583 - c. 1645) 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.
Jean Rey died at Le Bugue, where he had lived all his life.