Chapter 13, Problem 12Q

To determine

To explain: The reason of braking of glass when there is rapidly cooling or heating of a part than adjacent parts.

Answer to Problem 12Q

Due to uneven expansion and contraction when there is sudden change as one part is heated or cooled rapidly.

Explanation of Solution

Introduction:

As the temperature increases or decreases the glass material expand or contract respectively.

The glass is a brittle material. The brittle materials do not have plastic deformation. So, if there is a sudden change in the crystal structure it will break. If one part of the glass is heated it starts to expand then the other parts and if the glass is cooled, then it contracts compare to other parts. This sudden change will break the glass.

Conclusion:

Due to uneven expansion and contraction when there is sudden change as one part is heated or cooled rapidly.