platinum
n. precious metal, basic metallic element (Chemistry) | ||||
Search Dictionary:
Platinum definition was found in categories: Language, Idioms & Slang(4) Medicine(1) Arts & Humanities(1) Government(2) Science & Technology(5) Computer & Internet(1) Entertainment & Music(1) Society & Culture(1) Encyclopedia(1)
Platinum Definition from Language, Idioms & Slang Dictionaries & Glossaries
| Webster's Revised Unabridged Dictionary (1913) |
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. Formerly called platina.
(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. Formerly called platina.
| WordNet 2.0 |
platinum
Noun
1. a heavy precious metallic element; gray-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits
(synonym) Pt, atomic number 78
(hypernym) noble metal
Noun
1. a heavy precious metallic element; gray-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits
(synonym) Pt, atomic number 78
(hypernym) noble metal
| hEnglish - advanced version |
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
n : a heavy precious metallic element; gray-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits [syn: pt, atomic number 78 ]
platinum
symbol: pt atomic number: 78 atomic weight: 195.078 attractive greyish-white metal. when pure, it is malleable and ductile. does not oxidize in air, insoluble in hydrochloric and nitric acid. corroded by halogens, cyanides, sulphur and alkalis. hydrogen and oxygen react explosively in the presence of platinum. there are six stable isotopes and three radioisotopes, the most stable being pt-193 with a half-life of 60 years. platinum is used in jewelry, laboratory equipment, electrical contacts, dentistry, and anti-pollution devices in cars. ptcl2(nh3)2 is used to treat some forms of cancer. platinum-cobalt alloys have magnetic properties. it is also used in the definition of the standard hydrogen electrode. discovered by antonio de ulloa in south america in 1735. the name comes from the spanish word platina which means silver. platinum metal is generally not a health concern due to its unreactivity, however platinum compounds should be considered highly toxic.
-- elements
similar words(5)
platinum lamp
platinum metals
platinum-blonde
platinum sponge
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
n : a heavy precious metallic element; gray-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits [syn: pt, atomic number 78 ]
platinum
symbol: pt atomic number: 78 atomic weight: 195.078 attractive greyish-white metal. when pure, it is malleable and ductile. does not oxidize in air, insoluble in hydrochloric and nitric acid. corroded by halogens, cyanides, sulphur and alkalis. hydrogen and oxygen react explosively in the presence of platinum. there are six stable isotopes and three radioisotopes, the most stable being pt-193 with a half-life of 60 years. platinum is used in jewelry, laboratory equipment, electrical contacts, dentistry, and anti-pollution devices in cars. ptcl2(nh3)2 is used to treat some forms of cancer. platinum-cobalt alloys have magnetic properties. it is also used in the definition of the standard hydrogen electrode. discovered by antonio de ulloa in south america in 1735. the name comes from the spanish word platina which means silver. platinum metal is generally not a health concern due to its unreactivity, however platinum compounds should be considered highly toxic.
-- elements
similar words(5)
platinum lamp
platinum metals
platinum-blonde
platinum sponge
platinum black
| Concise English-Irish Dictionary v. 1.1 |
platinum
platanam
platanam
Platinum Definition from Medicine Dictionaries & Glossaries
| NCI Dictionary of Cancer Terms |
platinum
A metal that is an important component of some anticancer drugs, such as cisplatin and carboplatin.
A metal that is an important component of some anticancer drugs, such as cisplatin and carboplatin.
Platinum Definition from Arts & Humanities Dictionaries & Glossaries
| JM Latin-English Dictionary |
platinum
N
turntable
N
turntable
Platinum Definition from Government Dictionaries & Glossaries
| International Relations and Security Acronyms |
PLATINUM
Gulf War name for 1st (United Kingdom) Armoured Division objective
Gulf War name for 1st (United Kingdom) Armoured Division objective
| US Zip Codes |
99651
State: ALASKA
City: PLATINUM
State: ALASKA
City: PLATINUM
Platinum Definition from Science & Technology Dictionaries & Glossaries
| Mineralogy Database |
Platinum
General Information:
Chemical Formula:
Pt
Composition:
(Molecular Weight = 195.08 gm)
Platinum 100.0 % Pt
Empirical Formula:
Pt
Environment:
Mainly in grains and nuggets in alluvial deposits.
IMA Status:
Approved IMA 1974
Locality:
Most notably from the Urals, Russia and Brazil.
Name Origin:
Spanish, platina = "silver."
Physical Properties:
Cleavage:
None
Color:
whitish steel gray, steel gray, or dark gray.
Density:
14 - 22, Average = 18
Diaphaniety:
Opaque
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Nuggets - Irregular lumps produced by stream transport of malleable metals.,
Hardness:
4-4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Metallic
Streak:
grayish white
More details...
General Information:
Pt
(Molecular Weight = 195.08 gm)
Platinum 100.0 % Pt
Pt
Mainly in grains and nuggets in alluvial deposits.
Approved IMA 1974
Most notably from the Urals, Russia and Brazil.
Spanish, platina = "silver."
Physical Properties:
None
whitish steel gray, steel gray, or dark gray.
14 - 22, Average = 18
Opaque
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Nuggets - Irregular lumps produced by stream transport of malleable metals.,
4-4.5 - Between Fluorite and Apatite
Non-fluorescent.
Metallic
grayish white
More details...
Platinum (Pt )
Atomic Mass : 195.08
Atomic Number : 78
Name Origins: Spanish, platina = "silver."
Year Discovered : 1750
Discovery Credits : Known to pre-Columbian South Americans and taken to Europe about 1790.
More Details
| Minerals |
Platinum
Pt
Pt
| Dictionary of Automotive Terms |
Platinum
A precious metal sometimes used in the construction of breaker points . It conducts well and is highly resistant to burning.
A precious metal sometimes used in the construction of breaker points . It conducts well and is highly resistant to burning.
| Technical English by wpv |
Platinum
A noble metal which in its pure form is the negative wire of Type R and Type S thermocouples.
A noble metal which in its pure form is the negative wire of Type R and Type S thermocouples.
| Chemistry of the Elements |
Platinum
Name: platinum
Symbol: Pt
Atomic number: 78
Atomic weight: 195.078 (2)
Group in periodic table: 10
Group name: Precious metal
Period in periodic table: 6
Block in periodic table: d-block
CAS registry ID: 7440-06-4
Platinum is a beautiful silvery-white metal, when pure, and is malleable and ductile. It has a coefficient of expansion almost equal to that of soda-lime-silica glass, and is therefore used to make sealed electrodes in glass systems.
The metal does not oxidise in air. It is insoluble in hydrochloric and nitric acid, but dissolves when they are mixed as aqua regia, forming chloroplatinic acid (H2PtCl6), an important compound. It is corroded by halogens, cyanides, sulphur and alkalis. Hydrogen and oxygen gas mixtures explode in the presence of platinum wire.
Name: platinum
Symbol: Pt
Atomic number: 78
Atomic weight: 195.078 (2)
Group in periodic table: 10
Group name: Precious metal
Period in periodic table: 6
Block in periodic table: d-block
CAS registry ID: 7440-06-4
Platinum is a beautiful silvery-white metal, when pure, and is malleable and ductile. It has a coefficient of expansion almost equal to that of soda-lime-silica glass, and is therefore used to make sealed electrodes in glass systems.
The metal does not oxidise in air. It is insoluble in hydrochloric and nitric acid, but dissolves when they are mixed as aqua regia, forming chloroplatinic acid (H2PtCl6), an important compound. It is corroded by halogens, cyanides, sulphur and alkalis. Hydrogen and oxygen gas mixtures explode in the presence of platinum wire.
Platinum Definition from Computer & Internet Dictionaries & Glossaries
| An Everquest Glossary |
plat, pp
(n.) Platinum. Largest unit of currency in EverQuest. Equals 10 gold, 100 Silver or 1000 Copper.
(n.) Platinum. Largest unit of currency in EverQuest. Equals 10 gold, 100 Silver or 1000 Copper.
Platinum Definition from Entertainment & Music Dictionaries & Glossaries
| English to Federation-Standard Golic Vulcan |
Platinum
taluhk-tukh
taluhk-tukh
Platinum Definition from Society & Culture Dictionaries & Glossaries
| The Scotch Whisky by SDA v.4.20 |
Platinum Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Platinum
- This page is about the chemical element. For other uses, see Platinum (disambiguation).
| See more at Wikipedia.org... |