When an alloy is called Bronze, it usually means the alloy of copper and tin. When two words are used to name an alloy, and one of the words is Bronze, this means the alloy is made mostly from copper. The other word tells us what other metal was combined with copper to make it.
Other bronzes are:
Bronze is stronger than copper or tin alone. Bronze lasts longer than copper. Pure copper can be oxidized by air and also by water. When copper is oxidized by air or water, it turns green (the color of "copper oxide"), and falls apart.
When people learned how to make and work iron, the Bronze Age ended, and the Iron Age started. Iron can be made harder than bronze, but is susceptible to corrosion (see rust). Iron also wears away faster than bronze, when different pieces are moving against each other. Iron is very common, and easy to make. For this reason, iron costs less than bronze. This is the reason why iron is now used where bronze used to be used.
Bronze is still used to make many parts of machines. We use bronze when the part must last for a long time around water and air, or must not wear away. The main things that are made out of it are pump parts, bearings, bells, electrical components, gears, valves, and other things.
Part of a bronze portrait of Marcus Aurelius
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