What defines composite materials?

Composite materials are defined as materials that are made from two or more different constituents, which can be of different physical or chemical properties, combined in a way that enhances overall strength and other performance characteristics. The purpose of creating composite materials is to leverage the unique qualities of each constituent while minimizing the disadvantages of individual components.

For example, the combination of a stronger reinforcing material (like carbon fiber) with a lighter matrix material (like epoxy) results in a product that is both strong and lightweight, which is essential in various engineering and manufacturing applications, especially in aerospace, automotive, and sports equipment.

The other options reflect incorrect ideas about composite materials. For instance, while it is true that composites can be lightweight and flexible, that description does not encompass their defining characteristic of combining different materials for enhanced properties. Similarly, composites are not characterized by dissolving in water, nor are they limited to purely metallic compositions, as composites can also include fibers, polymers, ceramics, and other materials.