Definition of Platenum
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.
- Webster's Unabridged Dictionary (1913)
- The metallic chemical element with atomic number 78 and symbol Pt.
- A whitish grey colour, like that of the metal.
platinum colour:
- Of a whitish grey colour, like that of the metal.
- Of a musical recording that has sold over one million copies (for singles), or two million (for albums).
- The Nuttall Encyclopedia
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