Systems
Equilibrium
A state of balance where opposing forces or processes are equal, resulting in no net change. Systems at equilibrium resist perturbation but are not necessarily static.
Biological Context
Populations at equilibrium have births equal to deaths. Chemical reactions at equilibrium proceed in both directions at equal rates. Ecosystems may reach dynamic equilibrium where composition fluctuates around stable averages. Equilibrium can be stable (returns after perturbation) or unstable (collapses after small changes).