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[fahyuh r-damp] /ˈfaɪərˌdæmp/

noun, Mining.
a combustible gas consisting chiefly of methane, formed especially in coal mines, and dangerously explosive when mixed with certain proportions of atmospheric air.
the explosive mixture itself.
a mixture of hydrocarbons, chiefly methane, formed in coal mines. It forms explosive mixtures with air See also afterdamp


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