K gold (or gold) is an alloy formed by the fusion of gold and other metals. The "k" of K-gold is the compilation of the foreign word "Karat". The complete expression is gold opening (that is, k gold), and "AU" or "G" is an international symbol used to express the purity (that is, gold content) of gold. K gold is generally divided into 9K, 14K, 18K, 22K, 24K and so on. Theoretically, 24K represents 100% pure gold, but in practice, more than 99.9% can be called 24K gold.
Pure gold: pure gold with a gold content of not less than 99% is dark yellow, commonly known as two 9s. Pure gold is dark yellow in color, soft in texture and high in purity. Thousands of pure gold means that the gold content of gold jewelry is above 99.9%, because its highest gold content can reach 99.9%. Pure gold, with a gold content of 99%, commonly known as two 9s, is a little lower than thousands of pure gold.
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The use of gold:
1. Gold is a precious metal with magical power. Rare and precious, with stable value. It is a symbol of wealth and status. It has always been the goal pursued by people, and its status has never failed. Everyone knows that owning gold equals owning wealth, which is determined by the unique characteristics of gold.
2. Because of its excellent characteristics, gold has played the role of 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.
In addition, gold is also used in industry and technology. Because of its unique and perfect characteristics, gold has extremely high corrosion resistance stability. Good electrical and thermal conductivity; The gold nucleus has a large effective cross section to capture neutrons; The reflectivity of infrared ray is close to 100%.
Since the decoupling of gold and the dollar in 1970s, the golden functions of money has been weakening. In addition to the function of financial reserve, the investment function of gold has gradually emerged, and gold investment has begun to rise. As an investment product, gold has been used by investors in the investment field.
Baidu encyclopedia-gold
Baidu encyclopedia -k gold