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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Drop

Any one of the guttae attached to the underside of the mutules or triglyphs of a Doric entablature.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Agassi dropped serve early again early in the second set.
Henman dropped serve for the first time in 24 games of the tournament in the third game of the second set.
Djokovic found his range immediately and the writing was on the wall for Anderson when he dropped serve in the opening game.
But just as he did in Tuesday's match against Novak Djokovic, having levelled the match Federer promptly dropped serve.
That proved a crucial hold as Robson dropped serve again in the next game, saving two break points but not a third.
However, a dropped serve at the start of the decider had her back on the rack.
Not helped by a foot fault, Nieminen dropped serve in the opening game and Murray was firmly in control of the first set when he broke again to lead 4-1.
It was the first time Federer had dropped serve all week and put Murray right back in the contest.
An early break of serve in the decider put Murray 2-0 up and, after he dropped serve again, he broke Malisse to extend his lead and served out to reach round three.
Djokovic dropped serve in game seven to lose the first set 6-4, and was under pressure at 15-30 in the fifth game of the second but a stunning shot seemed to turn the match.
As quickly as it had sparked into life Del Potro's challenge withered in the decider after he dropped serve in the second game to hand the momentum back to world number four Murray.
Russia's Vera Zvonareva dropped serve in the second set but recovered to beat Flavia Pennetta 6-3 5-7 7-5.