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Some Important Properties of Metals
Why are metals of such importance for man’s life? The answer to this must be
found in their characteristic properties. The most important of these is strength, which
means that metals can withstand weight without bending and breaking. They are also
corrosion-resistant and may assume different shapes, which distinguishes them from
many other classes of materials. Some metals also have other special properties, two of
which are conductivity and the property to be magnetized.
Strength is of great importance for most industrial purposes. That is why steel is
widely used in modern industry. We know that steel constructions are used not only for
building ships, planes and engines but also in building industry as well as for producing
tubes, pipes, etc. For this purpose, engineers often use special kinds of steel.
As iron and steel are used more often than any other metal, we usually divide
metallurgical materials into two classes: ferrous metals and non-ferrous ones.
We know that engineers use copper and aluminium for conducting electric current
since these metals offer less resistance to it than ferrous metals do. A copper wire offers
less resistance to current than an aluminium wire of the same size does. But due to its
lighter weight aluminium offers less resistance per unit of weight.
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