Question

Which among the following expands on melting?

• A. Lead
• B. Wax
• C. Ice
• D. Copper

Answer 1

Answer: (A), (B), (D)

The correct options are
A

Lead

B

Wax

D

Copper

In most of the substances, melting causes expansion and freezing causes contraction. Water is an exception in a narrow range around the melting point. And it's a change that makes a big difference.

Between $0^{\circ }C$ to $4^{\circ }C$ , the melted water actually contracts as the temperature rises. Beyond $4^{\circ }C$ it starts to expand again. This phenomenon makes ice less dense than the water around it, which is the reason why ice floats.