試題詳解

49. An ideal gas undergoes an irreversible process from its initial state (P_i, V_i, T_i) to its final state (P_f, V_f, T_f). Which of the following statements is true?
(A) The change in the entropy of the gas is not well defined since it is an irreversible process.
(B) The change in the entropy is well defined and will increase when V_f > V_i.
(C) The change in the entropy is well defined and will increase when P_f > P_i.
(D) The change in the entropy is well defined and will increase when T_f > T_i.
(E) None of the above.