Definition of Metals. Meaning of Metals. Synonyms of Metals

Here you will find one or more explanations in English for the word Metals. Also in the bottom left of the page several parts of wikipedia pages related to the word Metals and, of course, Metals synonyms and on the right images related to the word Metals.

Definition of Metals

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Alkaline metals
Alkaline Al"ka*line (?; 277), a. [Cf. F. alcalin.] Of or pertaining to an alkali or to alkalies; having the properties of an alkali. Alkaline earths, certain substances, as lime, baryta, strontia, and magnesia, possessing some of the qualities of alkalies. Alkaline metals, potassium, sodium, c[ae]sium, lithium, rubidium. Alkaline reaction, a reaction indicating alkalinity, as by the action on limits, turmeric, etc.
Heavy metals
Heavy metals. (Chem.) See under Metal. Heavy weight, in wrestling, boxing, etc., a term applied to the heaviest of the classes into which contestants are divided. Cf. Feather weight (c), under Feather. Note: Heavy is used in composition to form many words which need no special explanation; as, heavy-built, heavy-browed, heavy-gaited, etc.
Noble metals
Noble No"ble, a. [Compar. Nobler; superl. Noblest.] [F. noble, fr. L. nobilis that can be or is known, well known, famous, highborn, noble, fr. noscere to know. See know.] 1. Possessing eminence, elevation, dignity, etc.; above whatever is low, mean, degrading, or dishonorable; magnanimous; as, a noble nature or action; a noble heart. Statues, with winding ivy crowned, belong To nobler poets for a nobler song. --Dryden. 2. Grand; stately; magnificent; splendid; as, a noble edifice. 3. Of exalted rank; of or pertaining to the nobility; distinguished from the masses by birth, station, or title; highborn; as, noble blood; a noble personage. Note: Noble is used in the formation of self-explaining compounds; as, noble-born, noble-hearted, noble-minded. Noble metals (Chem.), silver, gold, and platinum; -- so called from their freedom from oxidation and permanence in air. Copper, mercury, aluminium, palladium, rhodium, iridium, and osmium are sometimes included. Syn: Honorable; worthy; dignified; elevated; exalted; superior; sublime; great; eminent; illustrious; renowned; stately; splendid; magnificent; grand; magnanimous; generous; liberal; free.
Platinum metals
Platinum Plat"i*num, n. [NL., fr. Sp. platina, from plata silver, LL. plata a thin plate of metal. See Plate, and cf. Platina.] (Chem.) 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. Formerly called platina. Platinum black (Chem.), a soft, dull black powder, consisting of finely divided metallic platinum obtained by reduction and precipitation from its solutions. It absorbs oxygen to a high degree, and is employed as an oxidizer. Platinum lamp (Elec.), a kind of incandescent lamp of which the luminous medium is platinum. See under Incandescent. Platinum metals (Chem.), the group of metallic elements which in their chemical and physical properties resemble platinum. These consist of the light platinum group, viz., rhodium, ruthenium, and palladium, whose specific gravities are about 12; and the heavy platinum group, viz., osmium, iridium, and platinum, whose specific gravities are over 21. Platinum sponge (Chem.), metallic platinum in a gray, porous, spongy form, obtained by reducing the double chloride of platinum and ammonium. It absorbs oxygen, hydrogen, and certain other gases, to a high degree, and is employed as an agent in oxidizing.
Protometals
Protometals Pro`to*met"als, n. pl. A finer form of metals, indicated by enhanced lines in their spark spectra (which are also observed in the spectra of some stars), obtained at the highest available laboratory temperatures (--Lockyer); as protocalcium, protochromium, protocopper, protonickel, protosilicon, protostrontium, prototitanium, protovanadium. -- Pro`to*me*tal"ic, a.
Voltaic protection of metals
Voltaic Vol*ta"ic, a. [Cf. F. volta["i]que, It. voltaico.] 1. Of or pertaining to Alessandro Volta, who first devised apparatus for developing electric currents by chemical action, and established this branch of electric science; discovered by Volta; as, voltaic electricity. 2. Of or pertaining to voltaism, or voltaic electricity; as, voltaic induction; the voltaic arc. Note: See the Note under Galvanism. Voltaic arc, a luminous arc, of intense brilliancy, formed between carbon points as electrodes by the passage of a powerful voltaic current. Voltaic battery, an apparatus variously constructed, consisting of a series of plates or pieces of dissimilar metals, as copper and zinc, arranged in pairs, and subjected to the action of a saline or acid solution, by which a current of electricity is generated whenever the two poles, or ends of the series, are connected by a conductor; a galvanic battery. See Battery, 4. (b), and Note. Voltaic circuit. See under Circuit. Voltaic couple or element, a single pair of the connected plates of a battery. Voltaic electricity. See the Note under Electricity. Voltaic pile, a kind of voltaic battery consisting of alternate disks of dissimilar metals, separated by moistened cloth or paper. See 5th Pile. Voltaic protection of metals, the protection of a metal exposed to the corrosive action of sea water, saline or acid liquids, or the like, by associating it with a metal which is positive to it, as when iron is galvanized, or coated with zinc.

Meaning of Metals from wikipedia

- and non-ferrous metals; brittle metals and refractory metals; white metals; heavy and light metals; and base, noble, and precious metals. The Metallic elements...
- Heavy metals are generally defined as metals with relatively high densities, atomic weights, or atomic numbers. The criteria used, and whether metalloids...
- Precious metals are rare, naturally occurring metallic chemical elements of high economic value. Chemically, the precious metals tend to be less reactive...
- metallurgy, where the periodic table organizes elements of both light and heavy metals (e.g., uranium). An early use of the term in modern po****r culture was...
- f-block) are called inner transition metals and are sometimes considered to be transition metals as well. Since they are metals, they are lustrous and have good...
- number of elements counted as noble metals can be smaller or larger. In physics, there are only three noble metals: copper, silver and gold. In dentistry...
- the fifth alkali metal, is the most reactive of all the metals. All the alkali metals react with water, with the heavier alkali metals reacting more vigorously...
- between metals in extended solids such as bulk metals and metal subhalides. The premier example of a complex with an unsupported metal–metal bond is dimanganese...
- Refractory metals are a class of metals that are extraordinarily resistant to heat and wear. The expression is mostly used in the context of materials...
- transition metals and the chemically weak nonmetallic metalloids have received many names in the literature, such as post-transition metals, poor metals, other...