It is known by the name of metal to those chemical elements that are mainly characterized by being excellent conductors of heat and electricity, by showing a very important density and by remaining solid at normal temperatures.
Meanwhile, pure materials such as gold, silver and copper are called metals, but also to those alloys with metallic characteristics such as steel and bronze.
Between the most recognizable properties that metals generally present, we find that most are grayish in color, although in some the color is of another denominator such as yellow in gold and reddish in copper. Also, a considerable density, solidity, brilliance, malleability, ductility, toughness and conductivity of electricity and heat, are also counted as its characteristic properties.
In prehistoric times, metals were only used in their pure state (gold, silver, copper), although thanks to technological advances to which man gradually began to develop various techniques to obtain new metals from of its minerals, heating them in a charcoal kiln. The first advance in this sense was achieved with the obtaining of bronze, the product of using copper ore with forays of tin, for example. Then iron would follow, still in times before Christ, which was widely used to make the first weapons such as swords.
The metal is one of the elements most used and required by the industry, Since or due to their resistance or stability, among other issues, they are usually ideal to protect certain structures against corrosion, to stabilize plastic materials, although it can also be used in other fields such as medicine and chemistry, that is, not it all comes down to industry, even if it is the one that has the most metals.
