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250th anniversary: British scientist Joseph Priestley (pictured) liberated oxygen gas,...

Thu, August 1, 2024

2 yr ago

Source

In 1774, British scientist Joseph Priestley (pictured) liberated oxygen gas, corroborating the discovery of the element by the German-Swedish chemist Carl Wilhelm Scheele.

Also on Aug 1, 2024

Source, method and history
Source
Wikipedia
How we know
Wikipedia "On this day" selected anniversary, 250 years (1774 to 2024).
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