Definition of Platinu. Meaning of Platinu. Synonyms of Platinu
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Definition of Platinu
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Platinum 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.
Platinum black 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.
Platinum lamp 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.
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.
Platinum sponge 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.
Spongy platinum Spongy Spon"gy, a.
1. Soft, and full of cavities; of an open, loose, pliable
texture; as, a spongy excrescence; spongy earth; spongy
cake; spongy bones.
2. Wet; drenched; soaked and soft, like sponge; rainy.
``Spongy April.' --Shak.
3. Having the quality of imbibing fluids, like a sponge.
Spongy lead (Chem.), sponge lead. See under Sponge.
Spongy platinum. See under Platinum.
