A Guide to Physics Problems. Part 2. Thermodynamics, Statistical Physics, and Quantum Mechanics

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Therefore,

as it should, since (for the specified direction of the tensile force ) it
corresponds to a thermodynamicinequality for a system at equilibrium:

If hightemperature,

If

where we let Thechangeovertemperature isobviously

d) From (S.4.48.3),

At small , (S.4.48.7) becomes

SOLUTIONS