1, used as international reserve
Because of its excellent characteristics, gold has played a role as a currency in history, such as a measure of value, a means of circulation, a means of storage, a means of payment and a world currency. At present, gold still occupies a very important position in the international reserves of many countries, including major western countries.
2, used as jewelry decoration
Gorgeous gold ornaments are a symbol of one's social status and wealth.
3, applied to industry and science and technology
Gold has extremely high corrosion stability, good electrical conductivity and thermal conductivity. The gold nucleus has a large effective cross section to capture neutrons; The reflection ability of infrared ray is close to100%; It has various catalytic properties in gold alloys; Gold also has good manufacturability and can be easily processed into ultra-thin gold foil, micron gold thread and gold powder.
Gold is easy to be plated on the surface of other metals, pottery and glass, and it is easy to be welded and forged under certain pressure. Gold can be made into superconductor and organic gold. Because gold has so many beneficial properties, it is widely used in modern high-tech industries, such as electronic technology, communication technology, aerospace technology, chemical technology, medical technology and so on.
Physical properties of gold
1, color:
When gold melts, the steam emitted is yellow-green; Its gold powder is usually brown when it is melted; If it is cast into thin slices, it can transmit green light.
2. Extensibility:
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.