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August 1, 2025
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jan 1, 1766 - Henry Cavendish published in "On Factitious Airs" a description of "dephlogisticated air" by reacting zinc metal with hydrochloric acid and isolated a gas 7 to 11 times lighter than air.

Added to timeline:

2 Sep 2017
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1422

Date:

jan 1, 1766
Now
~ 259 years ago