Firedamp meaning

fīrdămp
A combustible gas, chiefly methane, occurring naturally in mines from the decomposition of coal.
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The explosive mixture of firedamp and air.
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A gas, largely methane, formed in coal mines, which is explosive when mixed with air.
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(mining) An inflammable gas (mostly methane) found in coal mines; forms an explosive mixture with air.
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Origin of firedamp