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Damp, in mining, name given to various dangerous gases. Firedamp is methane, a colorless compound of hydrogen and carbon that forms a highly explosive mixture with air. Afterdamp (mainly carbon dioxide and nitrogen), and chokedamp and blackdamp (mainly carbon dioxide) are other noxious mine gases.

See also: Methane.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Cretinism to Davis, David