What code is pure gold?

24k gold is often considered as pure gold.

Its melting point is as high as thousands of degrees, far higher than other copper and iron. "Real gold is not afraid of fire", which means that gold is not easy to melt under general flame and always keeps its original appearance. The melting point of gold is 163°C, and the boiling point is 288 C. After that, gold can be vaporized and volatilized.

gold can be made into extremely thin gold foil and extremely thin gold wire. Under modern processing conditions, pure gold can be processed into millimeter gold foil. Usually, 1 gram of gold can be drawn to 32 meters long. Various patterns woven with gold thread and silk thread are so-called "weaving gold" and "embroidering gold". Ancient emperors used princes and nobles as costumes. Gold is a good conductor of heat and electricity, and its conductivity is second only to platinum, mercury, lead and silver.

introduction of gold

gold has a pleasing luster. Gold is the yellowest of all metals. The colors of gold containing impurities and gold alloys containing other elements vary greatly. For example, gold-copper alloy is red, and silver makes gold from light yellow to light green or grayish white. Gold is easily worn away and becomes very fine powder. This is also the reason why gold is widely distributed in nature in a dispersed state.

The chemical properties of gold are relatively stable. Except for tellurium, selenium, chlorine and other elements, it is not easy for gold to react with other elements to form compounds under normal conditions. This property makes gold exposed to the air for a long time and changes its color and luster. The common fake gold is an alloy of copper, zinc, sulfur, etc., which is very similar to the appearance of gold when it is new, and will be exposed when it is oxidized for a long time.