Definition of increase of entropy
Thermodynamic definition
In thermodynamics, entropy is the thermodynamic parameter of the system, which represents the unavailable energy in the system and measures the system's ability to generate spontaneous processes. Entropy increases, the total energy of the system remains the same, but the available part decreases. The entropy of isolated systems will not decrease, which is also one of the manifestations of the second law of thermodynamics.
Statistical definition
In statistics, entropy measures the disorder of a system and represents the possibility that the system is in a different microscopic state under a given macroscopic state (such as temperature, pressure, volume, etc.), or that the microscopic system that constitutes the macroscopic system The number of ways. For example, it is known that there are 3 balls in 3 boxes, this is the macro state of the system, and the micro state is the distribution of the balls between different boxes (such as all 3 balls in the first box, or there is one in a box Ball etc.). The higher the entropy, the more difficult it is to accurately describe its microscopic state.