Gold is a precious metal with high value and content. Praise words such as "resplendent", "real gold is not afraid of fire" and "the book has its own gold house" all express the lofty position of gold in people's hearts.
use
In order to participate in future gold investment and gain opportunities for investment appreciation and preservation in the gold market, it is necessary to understand the attributes, characteristics and functions of gold in monetary finance. Gold is the most precious and rare one in the metal kingdom. Personal paper gold business, its quotation is similar to foreign exchange treasure business, that is, following the fluctuation of the international gold market, individuals earn the price difference by grasping the market trend. This business transaction is in grams, and the transaction threshold is above 10 gram of gold. It is worth noting that this business does not carry out physical delivery of gold, which is also the essential difference between paper gold business and physical gold business. In addition to bank counter transactions, investors can also conduct transactions through telephone banking and online banking channels, and obtain real-time quotations through counters, telephones or electronic screens on the Internet.
classify
Metals can be divided into two categories: ferrous metals and nonferrous metals. Ferrous metals, including pure iron and steel, are abundant and cheap metals. Nonferrous metals can be divided into three categories: precious metals, basic metals and alloys. Jewelry is made of iron-free metal. Gold is the most popular metal because of its pure texture and charming characteristics. Geologists' analysis report points out that gold is the rarest metal in the world except tantalum discovered in 1802, which proves the rarity of gold.
Color (color)
The beauty of golden yellow can be compared with the beauty of the sun. When gold boils, steam is green; Its gold powder is usually brown when it is melted; If it is cast into thin slices, it can transmit green light.
Tension (ductility)
Extremely powerful. 1 oz gold can be stretched to 50 miles long, and its ductility makes it easy to cast, making it a good choice for making jewelry. Of all metals, gold has the greatest pulling force.
Ductility (ductility)
Second to none. It will cause extremely thin gold sheets to roll up easily. Gold with a weight of 1 amp can be hammered to a thickness of 1 foot and a thickness of 100 square foot.
The ancients hammered it into thin slices and threw it into temples and palaces for decoration. It is said that 1 Antujin can be used to build the roof of a house. If you have a chance to visit these ancient temples, you should pay attention to it, or free gold tablets will fall on your head!
physical features
As a precious metal, gold has good physical properties, such as high melting point, reaching l064.43 degrees Celsius. "Real gold is not afraid of fire" means that gold is not easy to melt under the general flame. The density is19.31g/cm3 (at18℃), so it feels heavy. Good toughness and ductility, good electrical conductivity. Pure gold is bright yellow, but the color changes greatly after mixing with other metals, such as gold-copper alloy is dark red, and silver-containing alloy is light yellow or grayish white. Gold is easily ground into powder, which is also the reason why gold is dispersed in nature. Pure gold jewelry is also easy to wear and lose weight.
Because gold has the characteristics of great difficulty in mining, high mining cost and good physical properties, in the long-term social and historical development, gold is not only used as an ornament by human beings, but also endowed with the function of monetary value. It was not until 1970s that gold was separated from direct functions of money, that is, gold was not monetized. However, as a precious metal, gold is still the main international reserve in the world. According to the gold reserves published in 2000, at present, the countries and international institutions with the top 10 in the world are: the United States (8 137 tons), Germany (3,469 tons), the International Monetary Fund (32 17 tons), France (3,025 tons).
According to its nature, gold can be divided into "raw gold" and "ripe gold". Raw gold, also known as "primary gold", "natural gold" or "barren gold", is unrefined gold mined from mines or river beds. All refined gold is called "cooked gold". When other elements are added to cooked gold, the color of gold will change. People usually refer to the ripe gold containing only silver and no other metals as "pure gold" and the gold containing silver and other metals as "mixed gold". K-gold is the expression of color quality of mixed color gold, 4. 1666% gold is lK, and gold can be expressed as 24K, 22K, 20K, 18K according to the color quality of K-gold. The gold content of 24K gold is 99.998%, which is basically pure gold, and the gold content of 22K gold is 9 1.665%. The fineness of gold can also be directly expressed by content percentage, usually expressed by dividing the weight of gold by 65,438+0,000 parts. For example, 99.99% marked 9999 and 58.6% marked 586.
There are two color codes for gold products on the market: one is percentage, such as G999, and the other is K gold, such as G24K, G22K, G14K. In China, the imprint and identification card of gold products are stipulated. Generally, it is the manufacturer's code, material name, content stamp, etc. They are all necessary, and products without marks are unqualified. The same is true internationally. But for some very small products, it is also allowed to be unmarked.
The purity of gold:
The purity of gold and its products is called success or fineness.
More than 200 years BC, the Greek mathematician Archimedes worried about judging whether a crown was made of pure gold. When he was taking a bath in the bathtub, he discovered what later generations called Archimedes' law of specific gravity: an object immersed in a liquid was subjected to upward buoyancy; Buoyancy is equal to the weight of the liquid it displaces. Thereby successfully confirming whether the crown made by the king is made of pure gold.
How to express the purity of gold?
1. Use "k gold" to indicate the purity of gold.
According to the national standard GB 1 1887-89, the gold content per carat (abbreviation of English carat and German carat, often written as "K") is 4. 166%, so,
The gold content of each deposit is (national standard in brackets):
8k=8*4. 166%=33.328%(333‰)
9k=9*4. 166%=37.494%(375‰)
10k = 10 * 4. 166% = 4 1.660%(4 17‰)
12k = 12 * 4. 166% = 49.992%(500‰)
14k = 14 * 4. 166% = 58.324%(583‰)
18k = 18 * 4. 166% = 74.998%(750‰)
20k = 20 * 4. 166% = 83.320%(833‰)
2 1k = 2 1 * 4. 166% = 87.486%(875‰)
22k = 22 * 4. 166% = 9 1.652%(9 16‰)
24k = 24 * 4. 166% = 99.984%(999‰)
24K gold is often regarded as pure gold, which is "1000‰", but the actual gold content is 99.99%, which is converted into 23.988k (non-standard marking methods such as "9999 gold", "pure gold" and "24k gold" which do not actually exist have been banned internationally).
2. Use language to express the purity of gold
Some gold ornaments are marked with words that stipulate: pure gold-the gold content is not less than 990‰.