Which of the following is NOT a thermodynamical function?

Question

G1 Physics · Accepted Answer

Step 1: A thermodynamic function of state depends only on the present equilibrium state, not on how the system arrived there. Step 2: Internal energy U, enthalpy H = U + PV and Gibbs free energy G = H − TS are state functions. Step 3: Work W is path dependent; for a quasistatic volume change it is ∫P dV, which can differ for different paths between the same endpoints. Step 4: Therefore W is not a state function. Final answer: (B) Work done.