drop


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Related to drop: drop dead

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 classic literature ?
I remember the whole beginning as a succession of flights and drops, a little seesaw of the right throbs and the wrong.
And this, if you please, this is what Ben Weatherstaff beheld and which made his jaw drop.
But when Old Orlick come for to hear that your uncle Provis had mostlike wore the leg-iron wot Old Orlick had picked up, filed asunder, on these meshes ever so many year ago, and wot he kep by him till he dropped your sister with it, like a bullock, as he means to drop you - hey?
At first they heaved with a will, but when the stone was half way up they let it drop suddenly, and it fell to the bottom broken into a hundred pieces.
Silence," said the abbe; "you will force the last drop of blood from your veins.
An opiate vapour, dewy, dim, Exhales from out her golden rim, And, softly dripping, drop by drop, Upon the quiet mountain top.
I have some cards to leave at the other end of Bellevue Avenue, and I'll drop in at about half-past three and stay long enough to make poor Amy feel that she hasn't been slighted.
A waste of unused passages and staircases in which to drop a comb upon a bedroom floor at night is to send a stealthy footfall on an errand through the house.
Before he could fire again I had pulled him so far over the edge of the deck that he was forced to drop his firearm and clutch the rail with both hands.
So quickly did my bow drop after the shot that I scarce had time to lash Woola to the deck and buckle my own harness to a gunwale ring before the craft was hanging stern up and making her last long drop to ground.
Joe, himself in tears, gave the poor wretch the bottle, and Kennedy drained the last drop with savage haste.
Even as we gazed we could hear the process going on, for presently with a tiny splash a drop of water would fall from the far-off icicle on to the column below.