Which pair of metals exhibits the highest electrical and thermal conductivities for engineering applications?
Copper and aluminium
The question asks which pair combines the highest electrical and thermal conductivities among metals used in engineering.
Conductivity depends on how freely electrons move through the metal lattice, and among affordable engineering metals a small group stands well above the rest.
Copper has outstanding electrical and thermal conductivity, bettered only by silver, which makes it the first choice for wiring, busbars and heat exchangers.
Aluminium is the next widely used high-conductivity metal; it conducts somewhat less than copper but is far lighter and cheaper, so it is used for overhead lines, heat sinks and radiators.
Cast iron and wrought iron, and the mild and stainless steels, are ferrous metals whose conductivity is many times lower than copper's, so those pairs cannot lead.
Lead is a poor conductor and bronze, being a copper alloy, conducts less than pure copper, so that pair also falls short of copper and aluminium.
Hence, the answer is Copper and aluminium.
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