Entropy and Spontaneity

Entropy and Spontaneity

• Entropy Change of the Universe and Spontaneity

  • \Delta S_{\text{universe}} > 0: Indicates a spontaneous process.
  • Battery discharging causes the entropy of the universe to increase.
  • If the entropy of the universe increases, the process is considered spontaneous.

• Non-Spontaneous Processes

  • \Delta S_{\text{universe}} < 0: Indicates a non-spontaneous process.
  • If the entropy of the universe decreases, the process is non-spontaneous.
  • This condition can be described as "always" non-spontaneous.

• Temperature Dependence and Spontaneity

  • At low temperatures, a process may be non-spontaneous because the "arrow is in reverse".
  • Example: Water freezing may not increase entropy within a system.