Advanced Topic 510 of 1102 Kinetics & Equilibrium
Steady State vs Equilibrium
Steady state has constant concentrations from continuous flows, unlike closed-system equilibrium.
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In-depth explanation of Steady State vs Equilibrium
Steady state and equilibrium both describe systems whose concentrations do not change with time, but they differ in the net flows involved. In equilibrium a closed system has no net change, with forward and reverse processes exactly balanced and the free energy at a minimum. In a steady state an open system is continuously supplied with reactants and relieved of products, so concentrations are constant while there is a continuous net flux through the system. Steady state conditions are maintained only by ongoing energy input and do not correspond to minimum free energy. Living organisms, chemical reactors and flowing rivers all operate in steady states.
Going deeper: Steady State vs Equilibrium
Key ideas: Tests: at equilibrium net flux is zero and delta G = 0, and the system can be isolated without change. In steady state, flux is nonzero, delta G is negative, and removing the input makes the system drift. Steady state kinetics requires d[X]/dt = 0 for the intermediate while its formation and loss rates are each nonzero. Open reactors, called CSTRs, run at steady state.
Common mistakes and connections: Students use the terms interchangeably, or say that a constant concentration proves equilibrium. A leaking tank with constant inflow has constant level but is not at equilibrium. Another mistake is applying the equilibrium constant expression to a steady state mixture. Q differs from K there. The distinction links to the steady state approximation, biological systems, oscillating reactions and the second law.
Visualization of Steady State vs Equilibrium
Equilibrium is a closed system with no net flow; a steady state needs a continuous flux through an open system, like a river kept at constant level. The interactive lesson shows this as a live animation or chart.
Worked example and use case
A river whose water level stays constant while water keeps flowing through it is in a steady state rather than equilibrium.
Frequently asked questions about Steady State vs Equilibrium
What is Steady State vs Equilibrium?
Steady state has constant concentrations from continuous flows, unlike closed-system equilibrium.
Is Steady State vs Equilibrium a beginner, intermediate or advanced topic?
Steady State vs Equilibrium is a advanced topic in Kinetics & Equilibrium. It builds on beginner and intermediate topics, so review those first if needed.
What should I learn before Steady State vs Equilibrium?
Study these earlier topics in Kinetics & Equilibrium first: Partition Coefficient, Distribution Law, Equilibrium Constant of Water.
What comes after Steady State vs Equilibrium?
It is the last topic in Kinetics & Equilibrium. Explore the other areas for more chemistry.
Can I practise Steady State vs Equilibrium with quizzes?
Yes. The interactive lesson includes a self-check question on Steady State vs Equilibrium, and the Kinetics & Equilibrium quiz draws on every topic in this area.
Where Steady State vs Equilibrium fits in Kinetics & Equilibrium
Steady State vs Equilibrium is topic 91 of 91 in Kinetics & Equilibrium.