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5.13
Expert-verifiedUse a Maxwell relation from the previous problem and the third law of thermodynamics to prove that the thermal expansion coefficient (defined in Problem 1.7) must be zero at T=0.
Coefficient of Expansion becomes Zero at T=0.
We know that " The thermal expansion coefficient is defined as the fractional change in volume per unit temperature change".
This means
From the Maxwell relation
So,
From the the third law of thermodynamics as , the entropy approaches to zero or some constant value which is independent of pressure.
This means becomes Zero as and becomes 0.
We can conclude that coefficient of expansion becomes zero at
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