Definition of Metals. Meaning of Metals. Synonyms of Metals
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Definition of Metals
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Alkaline metalsAlkaline 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
Alkaline metals, potassium, sodium, c[ae]sium, lithium,
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 metalsNoble 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
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 metalsPlatinum Plat"i*num, n. [NL., fr. Sp. platina, from plata
silver, LL. plata a thin plate of metal. See Plate, and cf.
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. ProtometalsProtometals 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 metalsVoltaic 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
and light metals
; and base, noble, and precious metals
. The Metallic
- Heavy metals
are generally defined
high densities, atomic
weights, or atomic
numbers. The criteria
used, and whether
- 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
- 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...
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
- between metals
in extended solids
such as bulk metals
subhalides. The premier example
of a complex
with an unsupported metal
bond is dimanganese...
- Refractory metals
are a class
that are extraordinarily resistant
to heat and wear. The expression
used in the context
- transition metals
and the chemically
weak nonmetallic metalloids
in the literature, such as post-transition metals
, poor metals
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