Equilibrium

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In an equilibrium model, planets stay in their fixed orbits because of two equal and opposite forces: the velocity of their forward motion taking  them away from the sun, and force of gravity pulling them toward to the sun.

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A bathtub with its drain closed and its faucet shut off is in static equilibrium. When we unplug the drain and turn on the faucet so the same amount of water comes in and goes out, we see dynamic equilibrium at work.

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Complex adaptive systems have  many parts that continually modify their behavior as they respond to changes in their environment. Examples of complex adaptive systems include the human nervous system, political systems , social structures and even stock market.

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Newtonian system, of which equilibrium is one part, has been our model for how to think about the world for three hundred years. Complex adaptive systems might one day replace such old fashioned thinking.
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Only disequilibrium exists.
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Physical, chemical, and biological processes occur outside the thermodynamic equilibrium.

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A many-particle system is driven away from equilibrium, or evolve towards the equilibrium due to an interaction with an environment.

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