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Aluminium :: Aluminium (n.) The metallic base of alumina. This metal is white, but with a bluish tinge, and is remarkable for its resistance to oxidation, and for its lightness, having a specific gravity of about 2.6. Atomic weight 27.08. Symbol Al..

Wolframite :: Wolframite (n.) Tungstate of iron and manganese, generally of a brownish or grayish black color, submetallic luster, and high specific gravity. It occurs in cleavable masses, and also crystallized. Called also wolfram..

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..

Gravitation :: Gravitation (n.) That species of attraction or force by which all bodies or particles of matter in the universe tend toward each other; called also attraction of gravitation, universal gravitation, and universal gravity. See Attraction, and Weight..

Pendulum :: Pendulum (n.) A body so suspended from a fixed point as to swing freely to and fro by the alternate action of gravity and momentum. It is used to regulate the movements of clockwork and other machinery.

Tautochrone :: Tautochrone (n.) A curved line, such that a heavy body, descending along it by the action of gravity, will always arrive at the lowest point in the same time, wherever in the curve it may begin to fall; as, an inverted cycloid with its base horizontal is a tautochrone..

Areometer :: Areometer (n.) An instrument for measuring the specific gravity of fluids; a form hydrometer.

Slide :: Slide (n.) An inclined plane on which heavy bodies slide by the force of gravity, esp. one constructed on a mountain side for conveying logs by sliding them down..

Gravity :: Gravity (a.) The tendency of a mass of matter toward a center of attraction; esp., the tendency of a body toward the center of the earth; terrestrial gravitation..

Sobriety :: Sobriety (n.) Habitual freedom from enthusiasm, inordinate passion, or overheated imagination; calmness; coolness; gravity; seriousness; as, the sobriety of riper years..

Urinometry :: Urinometry (n.) The estimation of the specific gravity of urine by the urinometer.

Osmium :: Osmium (n.) A rare metallic element of the platinum group, found native as an alloy in platinum ore, and in iridosmine. It is a hard, infusible, bluish or grayish white metal, and the heaviest substance known. Its tetroxide is used in histological experiments to stain tissues. Symbol Os. Atomic weight 191.1. Specific gravity 22.477..

Rhodium :: Rhodium (n.) A rare element of the light platinum group. It is found in platinum ores, and obtained free as a white inert metal which it is very difficult to fuse. Symbol Rh. Atomic weight 104.1. Specific gravity 12..

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

Baryta :: Baryta (n.) An oxide of barium (or barytum); a heavy earth with a specific gravity above 4.

Demure :: Demure (a.) Affectedly modest, decorous, or serious; making a show of gravity..

Urinometer :: Urinometer (n.) A small hydrometer for determining the specific gravity of urine.

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

Solemnity :: Solemnity (n.) Ceremoniousness; impressiveness; seriousness; grave earnestness; formal dignity; gravity.

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..

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