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damp

damp, in mining, any mixture of gases in an underground mine, especially oxygen-deficient or noxious gases. The term damp probably is derived from the German dampf, meaning fog or vapor. Several distinct types of damp are recognized. Firedamp is methane and other flammable gases, often mixed with air; it results from the decomposition of coal or other carbonaceous materials. Explosive mixtures of firedamp with air usually contain from 1% to 14% methane. The mixture of gases that remains after a firedamp explosion is called afterdamp; it consists chiefly of carbon dioxide and nitrogen. Chokedamp is any mixture of oxygen-deficient mine gases that causes suffocation. (In England, carbon dioxide is called chokedamp.) Several methods are used for detection of damps. The Davy safety lamp is one of the earliest detection devices. The color and height of the lamp flame indicate the amount of firedamp present; if the flame is extinguished, chokedamp is present. Canaries were formerly kept in mines; the birds are overcome by relatively small quantities of noxious gases, and their death warned the miners of the presence of damps. Special colorimetric detectors are now used. The methanometer is a special portable instrument used to detect firedamp.
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damp

[damp]
(engineering)
To reduce the fire in a boiler or a furnace by putting a layer of damp coals or ashes on the fire bed.
(mining engineering)
A poisonous gas in a coal mine.
(physics)
To gradually diminish the amplitude of a vibration or oscillation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
"In February this year they drilled in through the wall and found the insulation was wet and said that's what's been causing the dampness.
Complaint James Henderson believes dampness is threatening his health 290319DAMP_01
Hitting out The mum , pictured in her living room, says the dampness is making her children unwell
However, a person with a lot of "dampness and heat" (Shi-Re) is usually short-tempered and often presents with an oily and acned face.
She added: "Vents were then put into Fay's cupboard but it still didn't solve the problem and the dampness started spreading to the bottom landing at the front door.
Home owners across the world are adopting waterproofing to protect their home against leakage and dampness.
Stewart John Smith AIT'S dampness. Spiders go to damp places because they have a similar smell to the scent of a female spider.
People with balanced constitution are generally easygoing and cheerful and do not suffer easily from disease, with strong adaptability to natural and social environment, while the phlegm-dampness constitution, formed due to the accumulation of phlegm and dampness, is characterized by fat posture, flabby abdomen, sticky mouth, and greasy coating on the tongue.
Hence, we hypothesize that dampness syndrome is the common syndrome in CHD and CRF and we would like to pursue the nature of dampness syndromes in patients with CHD and CRF since very few data is available.
As additional studies were published, a WHO report (4) provided stronger conclusions about these associations and considered dampness as a probable cause of new asthma onset as well as exacerbating preexisting asthma.
wheat shipment that has recently arrived at the port of Aqaba suffered dampness that led to some mold growth, according to Director-General of the Food and Drug Administration, Dr.
The studies carried out in recent years in European countries, Canada and the United States indicate that on average 20% of residential premises exhibit some signs of dampness [1].