gold - définition. Qu'est-ce que gold
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Qu'est-ce (qui) est gold - définition

CHEMICAL ELEMENT WITH SYMBOL AU AND ATOMIC NUMBER 79
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  • Cu]] alloys
  • Gold can be drawn into a monatomic wire, and then stretched more before it breaks.<ref name=":1" />
  • An early mention of gold in the ''[[Beowulf]]''
  • A 21.5k yellow gold pendant [[watch]] so-called "[[Boule de Genève]]" (Geneva ball), ca. 1890.
  • The [[Agusan image]], depicting a deity from northeast [[Mindanao]].
  • Gold(III) chloride solution in water
  • link=File:Gold_-_world_production_trend.svg%3Flang=en
  • ozt}} of gold that can be extracted from it, [[Toi gold mine]], [[Japan]].
  • raft]], he offered treasures to the ''[[Guatavita]]'' goddess in the middle of the [[sacred lake]]. This old Muisca tradition became the origin of the legend of El Dorado.<br /><small>This Muisca raft figure is on display in the [[Gold Museum, Bogotá]], Colombia.</small>
  • Gold price history in 1960–2020.
  • Ancient golden [[Kritonios Crown]], funerary or marriage material, 370–360 BC. From a grave in [[Armento]], [[Basilicata]]
  • [[Grasberg mine]], Indonesia is the world's largest gold mine.
  • Varna Museum]].
  • url=https://books.google.com/books?id=itIRAQAAMAAJ}}</ref>
  • Mirror for the [[James Webb Space Telescope]] coated in gold to reflect infrared light
  • Gold crafts from the Philippines]] prior to Western contact.
  • Kamakshi Amman Temple with golden roof, [[Kanchipuram]].
  • Finnish Lapland]] in 1898
  • 1938}}.
  • Moche]] gold necklace depicting feline heads. [[Larco Museum]] Collection, [[Lima, Peru]].
  • url=https://gallica.bnf.fr/ark:/12148/btv1b8510709q}}</ref>
  • Iron pyrite or "fool's gold"
  • abbr=on}} in area.
  • Danish]].
  • Schematic of a NE (left) to SW (right) cross-section through the 2.020-billion-year-old [[Vredefort impact structure]] in [[South Africa]] and how it distorted the contemporary geological structures. The present erosion level is shown. [[Johannesburg]] is located where the [[Witwatersrand Basin]] (the yellow layer) is exposed at the "present surface" line, just inside the crater rim, on the left. Not to scale.

gold         
n.
1) to mine; prospect for gold
2) to strike gold (also fig.) ('to discover smt. valuable')
3) pure, solid gold
4) a bar of gold
5) (misc.) as good as gold ('very good')
Gold         
·vt Money; riches; wealth.
II. Gold ·noun ·Alt. of Goolde.
III. Gold ·vt Figuratively, something precious or pure; as, hearts of gold.
IV. Gold ·vt A yellow color, like that of the metal; as, a flower tipped with gold.
V. Gold ·vt A metallic element, constituting the most precious metal used as a common commercial medium of exchange. It has a characteristic yellow color, is one of the heaviest substances known (specific gravity 19.32), is soft, and very malleable and ductile. It is quite unalterable by heat, moisture, and most corrosive agents, and therefore well suited for its use in coin and jewelry. Symbol Au (Aurum). Atomic weight 196.7.
Gold         
A metal, one of the elements; symbol Au. c .; atomic weight, 196.8; equivalent, 65.6; valency, 3; specific gravity 19.5. It is a conductor of electricity.
                                            Annealed.   Hard drawn.
Relative Resistance (Annealed Silver = 1),   1.369       1.393
Specific Resistance,                         2.058       2.094
Resistance of a wire at 0° C. (32°F.)
(a) 1 foot long, weighing 1 grain,          57.85     58.84   ohms
(b) 1 foot long, 1/1000 inch thick,         12.38     12.60    "
(c) 1 meter long, weighing 1 gram,            .4035     .4104  "
(d) 1 meter long, 1 millimeter thick,         .02620    .02668 "
Resistance of a 1 inch cube at 0° C.(32° F.)  .8102     .8247

Approximate increase in resistance per 0° C., (1.8° F)
at about 20° C. (68° F.), 0.365 per cent.

Electro-chemical equivalent (Hydrogen = .0105), .6888

Wikipédia

Gold

Gold is a chemical element with the symbol Au (from Latin aurum 'gold') and atomic number 79. This makes it one of the higher–atomic-number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal in pure form. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions.

Gold often occurs in free elemental (native state), as nuggets or grains, in rocks, veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as in electrum), naturally alloyed with other metals like copper and palladium, and mineral inclusions such as within pyrite. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides).

Gold is resistant to most acids, though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid), forming a soluble tetrachloroaurate anion. Gold is insoluble in nitric acid alone, which dissolves silver and base metals, a property long used to refine gold and confirm the presence of gold in metallic substances, giving rise to the term 'acid test'. Gold dissolves in alkaline solutions of cyanide, which are used in mining and electroplating. Gold also dissolves in mercury, forming amalgam alloys, and as the gold acts simply as a solute, this is not a chemical reaction.

A relatively rare element, gold is a precious metal that has been used for coinage, jewelry, and other arts throughout recorded history. In the past, a gold standard was often implemented as a monetary policy. Gold coins ceased to be minted as a circulating currency in the 1930s, and the world gold standard was abandoned for a fiat currency system after the Nixon shock measures of 1971.

In 2020, the world's largest gold producer was China, followed by Russia and Australia. A total of around 201,296 tonnes of gold exists above ground, as of 2020. This is equal to a cube with each side measuring roughly 21.7 meters (71 ft). The world consumption of new gold produced is about 50% in jewelry, 40% in investments and 10% in industry. Gold's high malleability, ductility, resistance to corrosion and most other chemical reactions, and conductivity of electricity have led to its continued use in corrosion-resistant electrical connectors in all types of computerized devices (its chief industrial use). Gold is also used in infrared shielding, production of colored glass, gold leafing, and tooth restoration. Certain gold salts are still used as anti-inflammatories in medicine.

Exemples du corpus de texte pour gold
1. "Buy Gold & Win Gold" was a promotion that covered 400 gold and jewelry outlets in Jeddah three main gold draws at three main shopping malls in Jeddah with 3,000 gold coins specially minted for the gold festival.
2. Highland Gold is owned 34 percent by Canada‘s Barrick Gold Corporation, the world‘s largest gold miner.
3. Highland Gold is owned 34 percent by Barrick Gold, the world‘s largest gold miner. «
4. "Uzbekistan produced gold, Kazakhstan produced gold and uranium.
5. Raiffeisenbank VISA, VISA Gold, Raiffeisenbank MasterCard and MasterCard Gold.