By now, we have some knowledge of metallurgy. The Industrial Revolution that took place in the 18th century changed the way in which metals were used so far.
Significant advancements took place in the fields of metal extraction and processing. Thanks to the invention of steam power and electric power, it was possible to have big machines that could make thousands of metal parts in a short time.
Till the Middle Ages, humans knew only seven metals. In fact, right up to the Industrial Revolution, only nine metals were known to humans – gold, copper, silver, lead, tin, iron, mercury, bismuth and antimony.
The invention of the electric battery led to the discovery of a process known as electrolysis by which electric current is passed through a substance to effect a chemical change. Electrolysis led to the discovery of many new metals, like magnesium and aluminium.
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