Some controversal points, like the absolute value of entropy and the proof of the unattainability of absolute zero by means of Carnot cycle, are discussed.
Based on this, the veracity of the rotor fault diagnosis can be improved through the distance of the information entropy curve chart at the multispeed.
The 'thermal hysteresis' of first-order ferroelectric phase transitions and the polydomain structure of ferroelectrics can be explained on the basis of the principle of minimum entropy production.