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Opal :: Opal (n.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity..

Brachystochrone :: Brachystochrone (n.) A curve, in which a body, starting from a given point, and descending solely by the force of gravity, will reach another given point in a shorter time than it could by any other path. This curve of quickest descent, as it is sometimes called, is, in a vacuum, the same as the cycloid..

Poluria :: Poluria (n.) A persistently excessive flow of watery urine, with low specific gravity and without the presence of either albumin or sugar. It is generally accompanied with more or less thirst..

Gravitational :: Gravitational (a.) Of or pertaining to the force of gravity; as, gravitational units..

Singular :: Singular (a.) Distinguished as existing in a very high degree; rarely equaled; eminent; extraordinary; exceptional; as, a man of singular gravity or attainments..

Lead :: Lead (n.) One of the elements, a heavy, pliable, inelastic metal, having a bright, bluish color, but easily tarnished. It is both malleable and ductile, though with little tenacity, and is used for tubes, sheets, bullets, etc. Its specific gravity is 11.37. It is easily fusible, forms alloys with other metals, and is an ingredient of solder and type metal. Atomic weight, 206.4. Symbol Pb (L. Plumbum). It is chiefly obtained from the mineral galena, lead sulphide..

Gravimeter :: Gravimeter (n.) An instrument for ascertaining the specific gravity of bodies.

Mercury :: Mercury (n.) A metallic element mostly obtained by reduction from cinnabar, one of its ores. It is a heavy, opaque, glistening liquid (commonly called quicksilver), and is used in barometers, thermometers, ect. Specific gravity 13.6. Symbol Hg (Hydrargyrum). Atomic weight 199.8. Mercury has a molecule which consists of only one atom. It was named by the alchemists after the god Mercury, and designated by his symbol, /..

Ice :: Ice (n.) Water or other fluid frozen or reduced to the solid state by cold; frozen water. It is a white or transparent colorless substance, crystalline, brittle, and viscoidal. Its specific gravity (0.92, that of water at 4¡ C. being 1.0) being less than that of water, ice floats..

Demurely :: Demurely (adv.) In a demure manner; soberly; gravely; -- now, commonly, with a mere show of gravity or modesty..

Glucinum :: Glucinum (n.) A rare metallic element, of a silver white color, and low specific gravity (2.1), resembling magnesium. It never occurs naturally in the free state, but is always combined, usually with silica or alumina, or both; as in the minerals phenacite, chrysoberyl, beryl or emerald, euclase, and danalite. It was named from its oxide glucina, which was known long before the element was isolated. Symbol Gl. Atomic weight 9.1. Called also beryllium..

Barite :: Barite (n.) Native sulphate of barium, a mineral occurring in transparent, colorless, white to yellow crystals (generally tabular), also in granular form, and in compact massive forms resembling marble. It has a high specific gravity, and hence is often called heavy spar. It is a common mineral in metallic veins..

Swim :: Swim (v. i.) To be supported by water or other fluid; not to sink; to float; as, any substance will swim, whose specific gravity is less than that of the fluid in which it is immersed..

Jinny Road :: "Jinny road () An inclined road in a coal mine, on which loaded cars descend by gravity, drawing up empty ones..

Iridium :: Iridium (n.) A rare metallic element, of the same group as platinum, which it much resembles, being silver-white, but harder, and brittle, and indifferent to most corrosive agents. With the exception of osmium, it is the heaviest substance known, its specific gravity being 22.4. Symbol Ir. Atomic weight 192.5..

Magnesium :: Magnesium (n.) A light silver-white metallic element, malleable and ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming (the oxide) magnesia, with the production of a blinding light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbol Mg. Atomic weight, 24.4. Specific gravity, 1.75..

Burlesque :: Burlesque (a.) Tending to excite laughter or contempt by extravagant images, or by a contrast between the subject and the manner of treating it, as when a trifling subject is treated with mock gravity; jocular; ironical..

Sulphur :: Sulphur (n.) A nonmetallic element occurring naturally in large quantities, either combined as in the sulphides (as pyrites) and sulphates (as gypsum), or native in volcanic regions, in vast beds mixed with gypsum and various earthy materials, from which it is melted out. Symbol S. Atomic weight 32. The specific gravity of ordinary octohedral sulphur is 2.05; of prismatic sulphur, 1.96..

Hydrometry :: Hydrometry (n.) The art of determining the specific gravity of liquids, and thence the strength of spirituous liquors, saline solutions, etc..

Pycnometer :: Pycnometer (n.) A specific gravity bottle; a standard flask for measuring and comparing the densities of liquids.

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