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 classic literature ?
With a convulsive shudder the thing stiffened, the jaws relaxed, dropping me to the ground, and then, careening once in mid air, the creature plunged headforemost to the road, full upon Woola, who still clung tenaciously to its gory head.
None of the designers of airships and aeroplanes had known clearly what their inventions might have to fight; many had not imagined they would have to fight anything whatever in the air; and had planned them only for the dropping of explosives.
Then suddenly from either side airships began dropping out of alignment, smitten by missiles he could neither see nor trace.
The three men stepped outside in time to see the two schooners go hastily about and head off shore, dropping mainsails and flying jibs on the run in the teeth of the squall that heeled them far over on the whitened water.
Bradley had now succeeded in wrestling his arm free from von Schoenvorts' grip and in dropping the latter with a blow from the butt of his pistol.
We knew she carried fourteen boats to our five (we were one short through the desertion of Wainwright), and she began dropping them far to leeward of our last boat, continued dropping them athwart our course, and finished dropping them far to windward of our first weather boat.
I could wish for nothing prettier and nothing more comfortable," I answered, dropping my voice, and beginning to discover already that Mr.
Venus explained under what conditions, and with what views, the dropping down upon Mr Boffin was held over until the Mounds should be cleared away.
Mr Venus could only repeat that it was his fixed intention to betake himself to the paths of science, and to walk in the same all the days of his life; not dropping down upon his fellow-creatures until they were deceased, and then only to articulate them to the best of his humble ability.
It MUST he more dropping down, I think,' said Mr Boffin to himself.
series for school and community libraries, Dropping In On Grant Wood by Pamela Geiger Stephens is nicely enhanced with full color illustrations from Jim McNeill and provides young readers with an informative, insightful, and entertaining exploration of the life and work of famed American artist Grant Wood.