damp


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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 methanemethane
, CH4, colorless, odorless, gaseous saturated hydrocarbon; the simplest alkane. It is less dense than air, melts at −184°C;, and boils at −161.4°C;. It is combustible and can form explosive mixtures with air.
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 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 lampsafety lamp,
oil lamp designed for safe use in mines and other places where flammable gases such as firedamp (see damp) may be present. Its invention (c.1816) is usually attributed to Sir Humphry Davy.
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 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.

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.
References in periodicals archive ?
These extract the damp from the room - a good one (and the cheapest may not be best) costs about PS400.
The aforementioned studies indicate that the mass proportional damping coefficient a does not have any negative effect on the accuracy of the simulation results but is not effective to damp out the numerical oscillations induced by Mode II loading, whose mechanical response belongs to high-frequency domain.
The company says a watertight, low-profile sheet membrane solution to the problem of persistent damp, Drybase Flex Membrane is a highly durable and flexible means of protection against moisture ingress.
Rising damp is caused by capillary suction of water through fine voids that occur in all masonry materials.
If it is damp, the paint will bubble as the moisture tries to escape and you will need to contact a damp-proof specialist - good to avoid if you can as they are expensive.
Firstly, damping torque analysis is applied to prove that FESS has the ability to damp the multi-mode oscillation.
THIS one's straight from my Gran: if you wipe down your bathroom mirror with a damp cloth and washing up liquid and let it dry, she promises me it will stay clear for a month.
In the modern world you would not think that damp proofing from London Home Counties would be a service there is very much demand for.
APRIL has certainly lived up to its showery reputation - as well as being no fun, rain can lead to leaks and damp problems.
It entails applying a nonionic liquid fabric treatment composition with at least one active ingredient to a nonwoven substrate, with the liquid fabric treatment composition being at ambient temperature when applied; placing damp clothing into the interior of the clothes dryer; placing the substrate into the clothes dryer, the liquid fabric treatment composition applied to the substrate being in liquid form when the substrate is placed into the interior of the clothes dryer; tumbling the damp clothing and the substrate in the clothes dryer with the damp clothing and the substrate not enclosed together within a bag or other container, and transferring an effective amount of the active ingredient from the substrate evenly throughout the damp clothing during the course of the drying cycle.
Despite bright spells, Britain's changeable weather could trigger problems with damp and condensation, which may go unnoticed.
A Moisture from the damp ground outside is probably coming through your concrete floor and walls.