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The king of metals - gold
Gold mainly in the Free State in nature, it always to his own luster to attract people, so the gold is found and the earliest human use of metals, has always been known as the "sunglassesmaker.com of metals." Bright yellow, has a beautiful appearance of gold; rare production of gold as the metal at all times remarkable.
A prominent feature of gold is smaller than the major and hardness, and its share of up to 19. 37, 1 kg of gold in the volume, is equivalent to each side of 3.71 cm cube. Gold is very soft, can use the nail scratches on its surface. Relatively high melting point of gold, to 1065 ℃, hence the "True gold fears fire," said. Gold will not rot, very stable chemical properties, from low to high temperature, from oakley sunglasses to outdoor, from the ground to the ground, is generally not oxidized, nor soluble in common acids and bases, but aqua regain is its "nemesis." (Note: 1 concentrated nitric acid is aqua regain and 3 were a mixture of concentrated hydrochloric acid, corrosive and can dissolve gold, platinum and some of the acids in general can not be dissolved metal.)
Not only that, malleable, ductile gold is very high. For example, gold can be pulled with 1g of gold into the 4km long, or pressed into only ten millionth of a millimeter thick 28 ray ban 3025 Meters of gold leaf, that is pressed into the thinnest of gold foil, one hundred thousand only a millimeter thick. Gold also has good thermal conductivity as well as many metals are higher than the conductivity.
Because there are so many different gold personality, combined with its small number produced in nature, so it has high social status and a wide range of uses.
Traditionally, gold is mainly used as currency and manufacturing accessories. In addition to a variety of ornaments made of gold jewelry such as rings, necklaces, bracelets endures, but also for building the gilt, the paste and gilded, the gold is not oxidized, it can be enduring. If we all know and admire the Monument to the chanel sunglasses on Tiananmen Square, the inscription above the after-run gold, these words despite the long-term rain and sun, but still glittering.
Gold is also used in decorative containers, dental, tip, medals and so on.
Gold most prominent one of the most important uses is due to its superior character, beautiful luster; few have been used as a stable production of currency. But when the gold as currency in circulation, is the prominent problems encountered in Gucci sunglasses
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To wear, under which people will come up with the daily use of cheaper silver, copper coins and paper money approach.
Just started using paper money, in order to obtain the trust of users to the provisions of a certain amount of gold it represents, and, when necessary, by notes to the bank to cash gold, called "gold standard." Although the world still have to use paper money, the gold standard also cease to exist because of inflation, but the number of gold reserves, is the measure of a country is still a sign of mens prada sunglasses Strength. Gold in the world economy still plays an important role, it is an important means of payment in international trade, is backed by foreign trade, foreign exchange is more reliable than any. That is, until today, gold is still the symbol of wealth.
With the rapid development of modern science and technology, especially in the 20th century have occurred since the 50s to the development of microelectronics technology and its universal application as the main symbol of the new technological silver tiffany jewelry , so the gold is widely used in industry and new technology. Such as welding materials for rockets, jet engines, supersonic
Speed aircraft, nuclear reactors require high strength at high temperature, high antioxidant components of the joints and contacts for high-precision instruments to ensure that electronic components and wire transfer instructions do not tiffany engagement rings
1 m interrupts. In the machinery industry, an alloy of gold and other metals for high strength and stability and is widely used; gold is also used for a variety of instruments critical part of the corrosion coating material. In the petrochemical industry, the gold instead of tiffany necklace radioisotopes are used as a catalyst, it can improve fuel combustion rate of 50%.
Gold was also used in the production of synthetic fibers spinning mode.
The most striking gold in one of the purposes is to pilot the clothes in the universe and life saving cord coated with a layer of gold less than two millionths mm thick, can tiffany bracelet astronauts from harmful radiation and solar heat. It is used on the firefighter's mask to prevent facial injuries by high-temperature baking without restricting the view.
Gold can also be used to hold corrosive gases, high pressure vessel liner. It can measure the maximum and minimum temperature, the sensitivity of the machine to tiffany co earrings Moving parts.
Construction on the skyscraper's windows for the gold, can not dazzling sun shining, it can not only block the outdoor heat radiation, but also reflected the indoor heating, so you can save costs for air conditioning and heat . In addition, gold can also treat certain types of rheumatoid arthritis.
We believe that with the development of modern science and technology, the practicality of gold will be newguccioutlet.com fully exploited.
Currently, the world's known gold mineral of about 40 species. Gold rock gold and placer gold deposits are generally divided into 2 categories. The formation of rock gold and volcanic activity and magma activities, it is the primary gold deposits.
Gold-bearing elements from the magma within the crust in the geological history of crustal movement due to rise, filling the crack in the rock cooled surface condensation gathered together. Placer gold is gold with rock weathering of rock gucci bags sale by external forces, in the course of the removal by the water, gold and the proportion deposited in a particular region, the influence of microbial activity in the formation of secondary deposits.
We have said before, gold is one of the reasons why expensive production of relatively few. In fact, the crust is not the absolute number of gold too small, for example, 1km from the surface to the depths of the crust, the total amount of gold is estimated at Gucci means shoes
http://www.newguccioutlet.com/gucci-shoes-c-67.html50 million tons. That is, the reason why low production of gold, because gold is too scattered distribution of the reason can not be extracted.
Discoveries of gold, about 6,000 years of history, then to now, it is estimated 9 million tons has been mined. China's Xia Dynasty about 4000 years ago, gold had been mined and used to Han, the output has been considerable.
China is very rich in gold resources. Most regions of China with the gold of the formation conditions, the current initial investigation, there are 27 provinces and autonomous gucci sunglasses have gold ore spot distribution. Gold resources have been found to have the county about 1000, gold mining in the county of more than 400. Provinces of Shandong, Heilongjiang, Hubei, Hubei, Henan, Guangxi, Tibet, Sichuan, Shaanxi, Yunnan and Xinjiang provinces is most concentrated. China has proven gold reserves in the fourth in the world in recent years, China's gold production ranks fourth in the world; Asia has become an important producer of gold. After years of exploration and development and construction, at present, Shandong, western Henan, Heilongjiang, Shaanxi and Gansu Sichuan border, has become a major gold production base in China. Among them, Shandong has become the most proven reserves, the largest production scale, develop the best long-term gold production base, the region has proven gold reserves accounting for 1 / 4, the country's total gold output to 1 / 3, was gucci mens belt As China's "Eldorado." Especially those with "Inching Tearful," said the Shandong Zhao Yuan County, is China's current annual output of gold most of any county, the county's exquisite gold is China's largest gold mine. In addition, like Heilongjiang Jialing County and Human County, Xinxiang’s Altay and other places is the famous gold producer.
Thus, since ancient times gold is a symbol of wealth and power. Rapid development in technology today, it is increasingly wide range of applications. After years of gucci wallet and development, has become the world's major gold-producing states.