Copper's thermal conductivity is also greater than other metals except again for silver. Copper has very good resistance to corrosion. Exposed to the atmosphere over a long time, it will, through oxidation, form a light green patina on its surface which protects indefinitely the metal underneath. Copper is easily worked and soldered, which enhances its suitability for electrical applications and piping. Copper is also well know for its alloys.
Bronze is harder and stronger than unalloyed copper.
The term bronze is now used to cover copper alloys in which metals other than zinc predominate, ie. Brass is primarily an alloy of copper and zinc. Many other alloys have been developed in recent years, especially those that improves copper's strength while maintaining high conductivity.