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The third law of thermodynamics
From the start the book takes the point of view of statistical rather than classical thermodynamics. Wilks looks at statistical approaches to the 2nd law, considering for example how the number of degrees of freedom of a system relates to its thermodynamical properties, and then goes on to show how these approaches may also be applied to the 3rd law. There is plenty of material on low temperature thermodynamics, exploring concepts such as frozen-in disorder, the thermodynamics of chemical reactions, and the behaviour of the different isotopes of helium. The book concludes with a chapter explaining the unattainability of absolute zero.