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Useful Knowledge: Volume 1. Minerals

Note 26 — PREFACE.

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Carbonic Acid is a compound of oxygen (21) and carbon, or pure charcoal (48): and in a state of gas (20) it forms a constituent part of the atmospheric air. It is also emitted in great abundance from wine, beer, and other liquors, in a state of fermentation, and is sometimes found in the lowest parts of mines, where it is known to the miners by the name of choke damp, from the circumstance of its immediately extinguishing 13flame, and suffocating all animals that are immersed in it. This gas, which was formerly called by chemists fixed air, is about twice the weight of common air. In combination with lime it forms chalk, marble, and limestone; and it constitutes part of several other mineral substances, which are thence denominated carbonats.

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