Questions and answers from 31 on Material Science and Engineering.
31. What is allotrope? In what forms of cubic pattern, iron exists ?
Some elements exist in more than one crystalline form. Each crystalline form is known as ‘allotrope’ of the element. Iron exists in two crystalline forms of cubic pattern, namely, body-centered cubic (BCC) and face-centered cubic (FCC).
32. When a material is known as allotropic or polytropic ?
A material is known as allotropic or polytropic if it exists in several forms at a different temperature.