What are the primary characteristics of metals commonly used in mechanical applications?

The primary characteristics of metals commonly used in mechanical applications include high strength, ductility, and excellent thermal and electrical conductivity.

High strength is essential for mechanical applications because it allows materials to withstand significant loads without deforming or breaking. Ductility, the ability to undergo significant deformation before failure, is crucial as it enables metals to be formed into various shapes and allows them to absorb energy during impact or stress without fracturing.

Additionally, metal's excellent thermal and electrical conductivity is vital in many applications, such as electrical wiring and heat exchangers. Metals like copper and aluminum are specifically favored for their ability to conduct heat and electricity efficiently.

In contrast, the other options present characteristics that do not accurately reflect the desired characteristics of metals for mechanical applications. For example, high ductility is not associated with low ductility, and metals ideally possess good thermal and electrical conductivity rather than low conductivity. Metals are also typically sought for their resistance to corrosion and, while density can vary, high density alone does not define the suitability for mechanical uses.