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Melting Point

A solid is he...

Question

A solid is heated from 0° to 100°C. Its volume increases from V₁ to V₂. It is now cooled to 0°C. Will its volume at 0°C be V₁ or V₂?

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Solution

At 0^oC, the volume of the solid will be V₁ again.
The molecules of solids are tightly packed. Therefore, on heating to 100^oC, the molecules just vibrate at their specific positions, thereby increasing the volume. Once the solids are cooled back to 0^oC, the molecules stop vibrating, thereby returning to their specific positions.

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