Question

Sheets of aluminium.ice.chalk.naphthalene balls.in which substances is rigidity present

Answer 1

The property of rigidity is strictly present in the sheets of chalk. Rigidity refers to stiffness of an object.

In simpler words, it means how hard the object is.

It is a characteristics which shows how far the object bends if force applied.

In case of high rigidity, the object will bend less or not at all.

The exact opposite is expected in case of low rigidity.

Answer 2

Rigidity is the property or the tendency to maintain its shape.

Out of these $\textbf{Sheets of Al }$ have rigidity.

As, all are either non metals or sublime in nature, so they can easily change shape.