Entropy () is a fundamental concept in thermodynamics and statistical mechanics that measures the amount of disorder or randomness in a system. It is a state function that characterizes the distribution of energy and matter within a system, and it provides insights into the system’s thermodynamic behavior and its tendency to evolve towards equilibrium.
- : Change in entropy of the system (in joules per kelvin, J/K).
- : Incremental amount of heat added reversibly to the system (in joules, J).
- : System temperature (in kelvin, K).