All solids must have length, breadth, and thickness.
Do solids vary much in length, breadth, and thickness?
Yes; they vary so much that we can scarcely find two things exactly alike in shape and size.
Can the shape of any substance be changed?
Yes; its shape may be changed in many ways.
What takes place in india-rubber when it is stretched?
Its particles are drawn farther apart, and its shape is altered.
When the force is removed, what does the india-rubber do?
It springs back into its former shape.
What is this property of the india-rubber called?