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 ?
It isn't that my true sympathies do not rest with these potential drop-outs.
Given that drop-outs have a massive impact on your business, the big question I ask is what are we as professionals doing about this?
Now in its sixth year, organisers expect more than 3,000 people to line up in Leeds Street, in Liverpool city centre, once drop-outs are accounted for.
On the other hand, the Premier said the national indicators of children's well-being have improved, mainly through strengthening the system of medical coverage, speeding up efforts to mitigate the mortality rate among mothers and children at birth, widespread vaccination in rural and urban areas, as well as by promoting education in rural areas and fighting drop-outs.
He said that after the GCE OL and AL there are a large number of drop-outs, and there are catering to these drop outs, as well as premature school drop outs and others.
The country further has a serious issue with school drop-outs a 38% of Bulgarians do not graduate a most of them leave as early as elementary school leading to increased unemployment and poverty risk.
Summary: TRIPOLI: After ministerial efforts failed to cut the number of school drop-outs, civil-society organizations have taken over the role of helping failing students stay in school.
1998: David Blunkett announced plans to pay school drop-outs an allowance to tempt them back into education.
Fulham join group winners Roma plus the likes of Champions League drop-outs Juventus, Liverpool and Atletico Madrid in the last 32 of the tournament after their well-deserved 3-2 victory over FC Basle on Wednesday.
I don't want my taxes to go to waste on these drop-outs.
IN a South Wales Echo editorial on February 19, 'Politicians go to war over academy costs', Labour Coun Rob Curtis rightly reserved particular criticism for Plaid Cymru's Coun Nick Hodges, who is quoted as saying the Defence Technical Academy at St Athan would be an 'isolated gated village' and also that 'nearby towns would get an increase in squaddie rowdiness and drop-outs from the academy'.
Everton face a difficult test at Fiorentina, who sit fourth in Serie A, while Rangers and Bolton have it even tougher against Champions League drop-outs Werder Bremen and Sporting Lisbon respectively.