drop

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drop

1. a steep or sheer incline or slope
2. Military the act of unloading troops, equipment, or supplies by parachute
3. Theatre See drop curtain
4. Nautical the midships height of a sail bent to a fixed yard
5. Austral Cricket slang a fall of the wicket
6. See drop shot
7. Rugby short for drop kick, drop-kick See also drop off dropout

Drop

Any one of the guttae attached to the underside of the mutules or triglyphs of a Doric entablature.

Drop

 

a small volume of liquid that is bounded in a state of equilibrium by a surface of rotation.

Drops form when a liquid flows slowly out of a small opening or runs off the edge of a surface, as well as when a liquid is atomized or emulsified. Drops also form when vapors condense on solid nonwettable surfaces and on condensation nuclei (ions, dust particles) in gaseous media; water droplets in the atmosphere arise in this way in the formation of dew, fog, and clouds.

The form of a drop is determined by the effect of surface tension (tending to decrease the surface of the drop) and external forces (above all, gravity). Microscopic drops for which gravity is not a decisive factor, and drops under the conditions of weightlessness have the form of a sphere, which is a body with minimum surface for a given volume. Large drops under earth conditions take a spherical form only when the densities of the drop and of the surrounding medium are equal. Falling raindrops, affected by gravity, the pressure of the opposing air current, and surface tension, assume the shape of a bun (broader across than vertically). Drops assume the shape of a flattened sphere on nonwettable surfaces, and they spread out on wettable surfaces.

The form and size of drops breaking away from the end of a capillary tube (pipette) depend on the diameter of the tube, the surface tension o~, and the density of the liquid. This relationship forms the basis for the determination of the surface tension of liquids from the weight of the drops leaving a vertical cylindrical tube (stalagmometer) and from the shape of the drops suspended from the end of a tube or resting on a flat surface.

IU. N. DROZHZHIN

drop

[dräp]
(fluid mechanics)
The quantity of liquid that coalesces into a single globule; sizes vary according to physical conditions and the properties of the fluid itself.
(hydrology)
The difference in water-surface elevations that is measured up-and downstream from a narrowing in the stream.
(metallurgy)
A casting defect due to the falling of a portion of sand from an overhanging section of the mold.
(mineralogy)
A funnel-shaped downward intrusion of sedimentary rock into the roof of a coal seam.
(plant pathology)
A fungus disease of various vegetables caused by Sclerotinia sclerotiorum and characterized by wilt and stem rot.

drop

1. Any one of the guttae under the mutules or triglyphs of a Doric entablature.
2. In a cabinet lock, the vertical dimension from the finished edge of the lock to the center of the cylinder or tube.
3. In air conditioning, the vertical distance that a horizontally projected airstream falls from its original elevation when leaving an outlet, measured at the end of the throw.
4. Same as drop curtain.
5. Same as drop panel.
6. Of a stair, a fitting used to close the bottom end of a tubular newel.
7. Same as pendant, 2; also see corner drop.
8. Same as turned drop.
References in periodicals archive ?
Even a modest reduction in the drop-out rate would have a very large and rapid impact on the number of engineers available to meet the future needs of our industry," Scalise concluded.
Rami Okasha, president of NUS Scotland, said: "The drop-out rate figures show finances and learning are linked.
Targeted support to students near high drop-out points will entail a
In Philadelphia, the Diplomas Now program is targeting the middle grades to pay attention to the "red flags" that often spell trouble later on, resulting in high drop-out rates, particularly in large urban centers.
3 percent drop-out rate cited does not take into account students who got their GEDs, rather than going through graduation, students scheduled to graduate this year, four students who went out of state and three that entered the Job Corps.
The other 13 were recruited through monthly support group meetings at the clinics (two participants from site A and six from site Band one drop-out from site A and four from site B).
7%, was a drop-out by 2004/05, when this rate had slipped to 9.
The Government believes UK drop-out rates are about 14 per cent.
Preventing drop-outs: In four years, Hamilton County has used the $8 million for creating a career-based magnet high school and a ninth-grade transition program that gives more attention to students in a year when the drop-out rate is high; mandating that all students graduate with college-bound class requirements.
The data from the Higher Education Statistics Agency charts the drop-out rates of students who enrolled in 2009/10, but were not in higher education the following academic year.
Speakers throughout the day focussed their presentations around the opportunities and business benefits that new wearers, upgrades and previous contact lens drop-out patients provide practitioners with.