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WAEC Physics 2015 Paper

Question : 16

Total: 50

Water is unsuitable for use as a thermometric liquid because it

Solution:

Concept:

A thermometric liquid must expand uniformly with temperature to give accurate, linear readings.

Explanation:

Water shows anomalous expansion behaviour, especially between

0^\circ\mathrm{C}

and

4^\circ\mathrm{C}

, where it contracts on heating.

Above this range, its expansion is not uniform up to about

40^\circ\mathrm{C}

This non-uniform expansion produces a non-linear scale and unreliable temperature measurements.

Hence, water cannot be used as a thermometric liquid.

Answer:

A. expands unevenly between

0^\circ\mathrm{C}

and

40^\circ\mathrm{C}

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