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  4. Coefficient of volumetric expansion αV is not a constant. It depends on temperature. Variation of αV with temperature T for metals is

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Q. Coefficient of volumetric expansion $\alpha_{V}$ is not a constant. It depends on temperature. Variation of $\alpha_{V}$ with temperature $T$ for metals is

Thermal Properties of Matter

Solution:

$\alpha_{V}$ is a characteristic of the substance but is not strictly a constant. It depends in general on temperature as shown in figure (c). It is seen that $\alpha_{V}$ becomes constant only at a higher temperature.