Copper was one of the first metals used by mankind. As early as in prehistoric times, people began to dig open-pit copper mines and used the copper obtained to make weapons, styles and other utensils, and the use of copper had a profound impact on the progress of early human civilization. Copper is a transition element, chemical symbol Cu. Pure copper is a soft metal, the surface is reddish-orange with metallic luster when it is just cut, and the monomers are purplish-red. Good ductility, thermal conductivity and high electrical conductivity, so in the cable and electrical and electronic components is the most commonly used materials, can also be used as building materials, can be composed of numerous kinds of alloys. Copper alloys have excellent mechanical properties and low electrical resistivity, the most important of which are bronze and brass. In addition, copper is a durable metal that can be recycled many times without loss of mechanical properties.
