damp

(redirected from dampest)
Also found in: Dictionary, Thesaurus, Medical, Legal, Idioms.

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.
..... Click the link for more information.
 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.
..... Click the link for more information.
 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 ?
By giving orders that Ettinger be placed in the coldest and dampest cell in the Lefortovo Prison, Abakumov hastened his death, as a result of which the "medical terror" case remained uninvestigated.
As the dampest area of the rotor begins to enter the regeneration zone, the cool, regenerated rotor matrix is being initiated into the process zone.
For one thing, he painted the famous "Last Supper" on the dampest wall of that Milan refectory.
The velocity of the air current tends to increase as it approaches the fan and at the same time near the greenest and dampest portions of the hay on top.
This coating was widely used on military guns which had to perform in the dampest of climatic conditions in Southeast Asia.
Typically for Ireland the dampest day of the year was slap bang in the middle of the summer holidays when 95mm dropped in Clonaslee, Co Laois, on August 1 - its wettest since 1985.
Many of us eager to experience what had been convincingly billed as The Joy of Sex found the real thing the dampest of possible squibs, with elements of embarrassment, discomfort and pure panic flung in for good measure.
Many of us eager to experience what had been convincingly billed as 'The Joy of Sex'found the real thing the dampest of possible squibs with elements of embarrassment, discomfort and pure panic flung in for good measure" - Broadcaster Vanessa Feltz.
AFTER one of the dampest Decembers on record the sun made a welcome return to Welsh skies yesterday.
The latest unwanted record comes after the dampest April across England and Wales since reliable rainfall records began in 1766.