Which concept is NOT synonymous with equilibrium?

Equilibrium refers to a state of balance or stability where opposing forces or influences are in relative harmony. It is often associated with systems that maintain a state of order and consistency, whether in physical, chemical, or biological contexts.

Stability suggests a system's ability to return to a balanced state after being disturbed. Balance indicates a distribution of forces that leads to no net change in the system. Homeostasis specifically relates to biological systems maintaining internal stability despite external fluctuations.

In contrast, chaos represents a state of disorder and unpredictability, lacking the characteristics of stability or balance. Therefore, chaos does not align with the concept of equilibrium, making it the correct choice in this question.