What does chokedamp mean?
Chokedamp is the name miners gave to the suffocating air found in poorly ventilated coal mines — air in which carbon dioxide has accumulated to the point where neither flame nor life can be sustained. Also known historically as blackdamp or stythe, it pools in the lowest recesses of workings because the gas is denser than ordinary air. Unlike firedamp, the explosive methane of mining lore, chokedamp kills not by burning but by smothering: it displaces breathable oxygen and extinguishes candles, making the traditional miner's flame lamp an unwitting early-warning device. The word belongs to a distinctive family of technical terms — firedamp, whitedamp — coined by generations of British colliers who faced these invisible hazards daily. Today it appears mostly in histories of mining disasters, heritage-museum displays, and discussions of industrial-era working conditions, though it remains part of the standard lexicon of mine gases. Its vivid, literal construction — air that chokes — makes it one of the more memorable relics of occupational vocabulary.
nounA poisonous or suffocating gas found in coal mines, chiefly carbon dioxide, which cannot support combustion or respiration. It accumulates in the lowest parts of mine workings and can asphyxiate miners.
- Air in a coal mine rendered unbreathable by an excess of carbon dioxide (also called blackdamp), which extinguishes flames and suffocates living things.
"The rescue team descended cautiously, knowing that pockets of chokedamp might lurk in the flooded lower galleries."
"The old workings lay full of chokedamp, so no flame would burn and no man could survive there without fresh-air lines."
"Ventilation shafts were driven deep to purge the tunnels of the chokedamp that pooled in every hollow."
Rarely pluralized; the term is normally treated as a mass noun referring to a type of gas or air.
"Different seams of the pit held their own chokedamps, each deadlier than the last."
Miners once tested for this invisible killer by lowering a caged canary — or even a lit candle — into the depths: where the flame went out, chokedamp had already claimed the air.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chokedamp
Chokedamp combines 'choke', from Old English ācēocian meaning to suffocate, with 'damp', used since at least the 18th century by British miners as a general term for mine gas — a usage likely influenced by German Dampf ('vapor' or 'steam'). The compound names the gas by its most feared effect: air thick enough to choke a man or snuff out his candle. It stands alongside sibling coinages such as firedamp (methane) and whitedamp (carbon monoxide), forming a small technical vocabulary that grew out of the dangerous realities of underground coal mining.
How chokedamp is actually used
A technical term from mining vocabulary, now largely historical but still used in accounts of mining disasters and industrial history. It belongs to a family of specialized 'damps' (firedamp, whitedamp) named by 18th- and 19th-century British miners; register is formal/technical rather than everyday.
Easily confused with chokedamp
Firedamp is flammable methane gas that can explode, whereas chokedamp is nonflammable carbon dioxide that simply smothers breathing and flames.
Whitedamp is toxic carbon monoxide, a different mine gas from chokedamp's largely inert carbon dioxide.