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 ?
Before getting into the zone blitz package, we believe it's essential to discuss personnel and each defenders base zone drop.
A pension plan's liabilities will be unfavorably impacted if (I) the DROP increases the economic value of pension benefits to DROP retirees, (2) there are more DROP winners than DROP losers, and (3) the actual age at which employees retire is younger than anticipated by the DROP retirement assumptions.
With a magnetic head--similar to the one in a hard disk drive--under a chip, he envisions shuttling many drops around at high speeds in a programmed fashion.
Data were also analyzed according to residential address for each student to test the assumption that students from identified low-income neighborhoods were more likely to drop out of school.
Despite the forecasted drop in construction activity in '00-'0 1, ductile iron usage for the construction machinery and oilfield equipment markets should grow by annual rates of 2% and 8-10%, respectively.
The 116-point January 23 drop seemed to be set off in part by investors using "technical analysis," the practice of charting broad market trends and selling off when the market seems to have reached a certain plateau, and in part by traders selling stocks and futures to exploit discrepancies between the stock and futures prices.
However, unless they drop shot at the right time and in the right conditions, the tactic can backfire badly.
color) A dummy rocket booster is ready to drop from Burt Rutan's Proteus aircraft over the Mojave Desert, in a test of a new launch system.
Several years ago, a team of researchers in Japan used a beam of light to move drops of oil around on a surface.
and a 15% drop in medium-to-heavy trucks and trailer production still is expected.
The result is less resistance to flow and more uniform pressure to each drop.