Entropy constantly rises in an isolated system, according to the second rule of thermodynamics. Any isolated system will naturally progress towards thermal equilibrium, which is the condition in which the system's entropy is greatest.
The value of entropy, a thermodynamic variable, depends on the physical state or circumstance of a system. In other terms, it is a thermodynamic function that is used to quantify disorder or randomness.
The second law of thermodynamics, which states that entropy tends to rise over time in an isolated system, provides the thermodynamic arrow of time.
Therefore,
This definition's most essential result is that entropy, as a state function, is not a function of time.
Entropy does not fluctuate over time, and it does not tend to increase. Entropy is commonly said to increase towards its maximum at equilibrium.