Carbonic dioxide gas. Dr. Black gave it this name, because carbonate of magnesia evolved by heat carbonic acid, that is, MgO, CO2 evolved CO2, thereby proving that CO2 (carbonic acid) is a “fixed air.”
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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