Fixed Air (Gas Sylvestre). Fixed air had first been synthesised by Joseph Black in 1750-1752 by heating magnesium carbonate He named it so because it was “fixed” (absorbed) by alkalis It was identical to van Helmont’s, Gas Sylvestre, discovered in 1648 We call it carbon dioxide.
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The Laboratory of “Gunpowder Joe” Priestley was set on fire by rioters in 1791. (Ironically given his scientific interests in combustion!)It happened because of his religious beliefs and sympathies toward revolution. He emigrated to America in 1794.