As we all know, gold is a valuable precious metal, worth 385 yuan per gram. Most of it is put into the national treasury by the national government for good preservation. Most of them are gold. Gold pieces are naturally used to make valuable articles. Objects cast with gold are usually jewelry, currency, substitute currency and the like, such as rings, necklaces, gold coins (ancient times), gold bricks, gold bars, etc. There are also some objects used to make celestial globe.
In ancient China, silver was a precious metal with a silvery-white appearance. It held great value and was used to create silver ingots and coins for both state expenditure and daily transactions. The ancient Egyptians discovered the bactericidal properties of water-soluble silver ions, leading them to create silver tablets for treating wounds. Today, silver continues to be widely utilized in jewelry making due to its beauty and versatility. Additionally, its exceptional conductivity and heat transfer capabilities make it a valuable resource in various industries. Within electronic instruments and power generation equipment, silver components like core wires are commonly found.
Copper has played a vital role in the rise of human civilization, serving as a symbolic messenger throughout history. In ancient times, copper was highly revered, being utilized to craft significant ritual vessels like bronze tripods. Even in today's modern era, copper continues to hold immense value, as it is extensively used to produce tools and equipment.
One of the remarkable attributes of copper is its exceptional conductivity, making it second only to silver in this aspect. This exceptional characteristic has made copper an invaluable material for various applications. Moreover, copper ore is abundantly available and more affordable compared to its silver counterpart, enhancing its practicality and accessibility.
In contemporary times, copper finds extensive usage in the production of wire cores and components for communication and electronic devices. This versatile metal is employed in the creation of crucial parts that facilitate the seamless functioning of communication equipment. Furthermore, electronic devices rely on copper for its diligent performance and efficient conductivity.
Thus, copper's enduring significance in human civilization persists, driven by its remarkable properties and practical advantages. From its ancient usage in sacred vessels to its indispensable role in modern technology, copper remains an irreplaceable element, connecting the past and present realms of human progress.
Iron is an incredibly versatile metal that is heavily utilized worldwide, and its abundance on our planet is remarkable. As a matter of fact, the known reserves of iron ore surpass 200 billion tons globally. Among the two most prevalent types of iron that are used regularly, magnetite and hematite hold the top spots.
