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An Introduction to Thermal Physics
Found in: Page 159
An Introduction to Thermal Physics

An Introduction to Thermal Physics

Book edition 1st
Author(s) Daniel V. Schroeder
Pages 356 pages
ISBN 9780201380279

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Short Answer

Use a Maxwell relation from the previous problem and the third law of thermodynamics to prove that the thermal expansion coefficient β (defined in Problem 1.7) must be zero at T=0.

Coefficient of Expansion becomes Zero at T=0.

See the step by step solution

Step by Step Solution

Given Information

Maxwell relation :VTP=-δSδPT

Explanation

We know that " The thermal expansion coefficient is defined as the fractional change in volume per unit temperature change".

This means

β=ΔV/VΔTβ=1VVTP

From the Maxwell relation -δSδPT

So,

β=1VVTPβ=-1VδSδPT

From the the third law of thermodynamics as T0, the entropy approaches to zero or some constant value which is independent of pressure.

This means δSδPTbecomes Zero as T0. and βbecomes 0.

We can conclude that coefficient of expansion becomes zero at T0.

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