English definition of Platinum

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Definition of platinum

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Platinum (n.) A metallic element, intermediate in value between silver and gold, occurring native or alloyed with other metals, also as the platinum arsenide (sperrylite). It is heavy tin-white metal which is ductile and malleable, but very infusible, and characterized by its resistance to strong chemical reagents. It is used for crucibles, for stills for sulphuric acid, rarely for coin, and in the form of foil and wire for many purposes. Specific gravity 21.5. Atomic weight 194.3. Symbol Pt. Fo

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Geissler Tube :: Geissler tube () A glass tube provided with platinum electrodes, and containing some gas under very low tension, which becomes luminous when an electrical discharge is passed through it; -- so called from the name of a noted maker in germany. It is called also Plucker tube, from the German physicist who devised it..

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..

Platinocyanide :: Platinocyanide (n.) A double cyanide of platinum and some other metal or radical; a salt of platinocyanic acid.

Crucible :: Crucible (n.) A vessel or melting pot, composed of some very refractory substance, as clay, graphite, platinum, and used for melting and calcining substances which require a strong degree of heat, as metals, ores, etc..

Acetal :: Acetal (n.) A limpid, colorless, inflammable liquid from the slow oxidation of alcohol under the influence of platinum black..

Platiniridium :: Platiniridium (n.) A natural alloy of platinum and iridium occurring in grayish metallic rounded or cubical grains with platinum.

Platinochloride :: Platinochloride (n.) A double chloride of platinum and some other metal or radical; a salt of platinochloric acid.

Sperrylite :: Sperrylite (n.) An arsenide of platinum occuring in grains and minute isometric crystals of tin-white color. It is found near Sudbury, Ontario Canada, and is the only known compound of platinum occuring in nature..

Ruthenium :: Ruthenium (n.) A rare element of the light platinum group, found associated with platinum ores, and isolated as a hard, brittle steel-gray metal which is very infusible. Symbol Ru. Atomic weight 103.5. Specific gravity 12.26. See Platinum metals, under Platinum..

Platinoid :: Platinoid (a.) Resembling platinum.

Davyum :: Davyum (n.) A rare metallic element found in platinum ore. It is a white malleable substance. Symbol Da. Atomic weight 154.

Inoxidizable :: Inoxidizable (a.) Incapable of being oxidized; as, gold and platinum are inoxidizable in the air..

Platinous :: Platinous (a.) Of, pertaining to, or containing, platinum; -- used specifically to designate those compounds in which the element has a lower valence, as contrasted with the platinic compounds; as, platinous chloride (PtCl2)..

Ignite :: Ignite (v. t.) To subject to the action of intense heat; to heat strongly; -- often said of incombustible or infusible substances; as, to ignite iron or platinum..

Plate :: Plate (n.) That part of an artificial set of teeth which fits to the mouth, and holds the teeth in place. It may be of gold, platinum, silver, rubber, celluloid, etc..

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..

Occlude :: Occlude (v. t.) To take in and retain; to absorb; -- said especially with respect to gases; as iron, platinum, and palladium occlude large volumes of hydrogen..

Palladium :: Palladium (n.) A rare metallic element of the light platinum group, found native, and also alloyed with platinum and gold. It is a silver-white metal resembling platinum, and like it permanent and untarnished in the air, but is more easily fusible. It is unique in its power of occluding hydrogen, which it does to the extent of nearly a thousand volumes, forming the alloy Pd2H. It is used for graduated circles and verniers, for plating certain silver goods, and somewhat in dentistry. It was so na

Platinic :: Platinic (a.) Of, pertaining to, or containing, platinum; -- used specifically to designate those compounds in which the element has a higher valence, as contrasted with the platinous compounds; as, platinic chloride (PtCl4)..

Catalytic :: Catalytic (n.) An agent employed in catalysis, as platinum black, aluminium chloride, etc..