Which thermodynamic law introduces the fundamental concept of entropy and states that the total entropy of an isolated system can never decrease over time?

💡 Solution & Explanation

The second law of thermodynamics establishes that natural processes are directional and accompanied by an increase in entropy, which measures the degree of disorder or unavailability of thermal energy for conversion into mechanical work. The first law addresses energy conservation, while the zeroth law defines thermal equilibrium and temperature. The third law states that a system entropy approaches a constant value as temperature approaches absolute zero.