Which one of the following statements are true? A. In an ideal fluid, entropy decreases with time. B. For a reversible, adiabatic process in an incompressible fluid, enthalpy is conserved. C. For a reversible, adiabatic process, in a compressible fluid, the internal energy is always conserved. D. For a reversible, adiabatic process in an incompressible fluid, the internal energy is always conserved. E. None of the above is true.

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.