Test Index

JAMB Physics 2020 Paper

Question : 5

Total: 38

In what range of temperature is the expansion of water anomalous?

Solution:

Concept:

Water behaves unusually between

0^{\circ}\mathrm{C}

and

4^{\circ}\mathrm{C}

: instead of expanding when heated, it contracts.

Explanation:

• For most liquids, heating causes expansion.

• Water is densest at

4^{\circ}\mathrm{C}

• From

0^{\circ}\mathrm{C}

4^{\circ}\mathrm{C}

, water contracts as temperature rises.

• Above

4^{\circ}\mathrm{C}

, water expands normally.

• Therefore, the anomalous expansion occurs in the range

0^{\circ}\mathrm{C}

4^{\circ}\mathrm{C}

Answer:

0^{\circ}\mathrm{C}

+4^{\circ}\mathrm{C}

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