chapter  5
25 Pages

Identifying and selecting engineering materials

Atoms are the smallest particles of any substance that can be found. There are about 90 elements occurring naturally on earth and all materials are made from elements. A material that consists of only one element is said to be pure; however, most materials in their natural state are mixtures of many elements and are known as raw materials. These raw materials must be processed if they are to be of use in industry.