Properties of gold

Gold is the earliest metal discovered and used by mankind. Mankind can pick up this elemental metal that reflects the dazzling yellow brilliance from nature very early. Gold was discovered and used by mankind 10,000 years ago. The history of mankind's discovery and use of gold is more than what we are now familiar with. Gold is the earliest metal discovered and used by mankind. Mankind can pick it up from nature very early. A simple metal that reflects the dazzling yellow brilliance. Gold was discovered and used by mankind 10,000 years ago. The history of mankind's discovery and use of gold is thousands of years earlier than the many common metals we are now familiar with, such as copper, iron, and aluminum. The reason why gold was first recognized by mankind is because of the special physical properties of gold. Gold can exist in the form of simple substance in nature, while other metals often exist in the form of compounds. Gold can give off a noble and brilliant yellow luster under the sun. Gold means 'dawn' in Latin and 'touchable sun' in ancient Egyptian writing. Gold is very precious because it is extremely rare. Gold mining costs are very high, many physical properties are very good, and it has excellent stability for long-term storage. These characteristics make gold particularly favored by human society. Gold has become a complex mechanism of human society. An important part. Because of these special natural attributes of gold, human beings have given it social attributes, that is, the function of currency in circulation. Gold has become mankind's material wealth and an important means for mankind to store wealth. Marx wrote in 'Das Kapital':'Money is naturally not gold and silver, but gold and silver are naturally money'. In the past few thousand years of human history, gold has basically belonged to the wealth that the emperors and nobles can possess. Owning gold means a symbol of power. It is gold that makes the civilizations of ancient Egypt and ancient Rome look unusually brilliant. In ancient civilizations, gold had a very high status in the society at the time. In addition to being owned by the emperors and nobles, gold was also generally considered by human society to be a fetish that can only be possessed by gods. People dedicated gold to worshipped gods. Gold has become a special material for worshipping utensils and decorating the image of protective gods. The physical properties of gold: Gold is a kind of precious metal with a yellow luster, and it is one of the most precious and rare metals in the metal kingdom. The atomic number of gold in Mendeleev’s periodic table is 79. Gold has good chemical stability. In the metal market, gold and ruthenium, rhodium, palladium, osmium, iridium, platinum, silver and other metals are collectively referred to as precious metals. Gold has good physical properties. Its melting point is high, reaching l064.43 degrees Celsius. 'Real gold is not afraid of fire' means that gold is not easy to melt under normal flames; it has a high density of 19.31 g/cm3, and it feels heavy. A pure gold ball with a diameter of only 46 mm has a weight of 1,000 grams; it has good toughness and ductility. 1 ounce of gold can be drawn into 50 li gold wires, and gold can be ground into a transparent green gold leaf with a thickness of 0.001 mm. The ductility makes it easy to cast and is a good choice for making jewelry; gold is a good conductor of heat and electricity, but it is not as conductive as platinum, mercury, lead, and silver; gold is very resistant to oxidation, and the physical properties of elemental gold The stability is very good, so there is a single substance of gold in nature; gold is easy to be ground into powder, which is the reason why gold is dispersed in nature, and pure gold jewelry is also easy to wear and reduce its weight. Pure gold can reflect a brilliant yellow, and the color changes greatly after being mixed with other metals. For example, gold-copper alloys are dark red, and silver-containing alloys are light yellow or off-white. When gold is melted, the steam emitted is green. During the smelting process of gold, its gold powder is usually brown. If the gold is made into thin gold foil, the gold will be green when viewed in the light. Previous: The concept of gold Next: How to identify gold jewelry