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Advanced PhysicsQ&A LibraryConsider taking the Legendre transform of the energy, E(S,V,N), with respect to S, V, and N, to get a newthermodynamic potential, X(T.p,u).(a) Show that X(T.p,µ) is identically zero.(b) What does this imply about the variables T, p, and µ? Where have you already seen this result before?Question

Asked Feb 6, 2020

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It's a thermodynamics question.

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Step 1

Write the expression for the total differential of the energy *E* given as a function of entropy *S*, volume *V*, and number of particles *N*.

Step 2

Here *T* is the temperature, *p* is the pressure and *μ *is the chemical potential.

In the above expression, the conjugate pair of variables are (*T, S*), (*p*, *V*) and (*μ*, *N*).

To obtain the function *X *(*T, p, μ*) through Legendre transformation, consider an arbitrary function *Y* that assumes the following form.

Step 3

Take the total differential of above function and simplify the expression.

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