|Intelligent Systems And Their Societies||Walter Fritz|
This is a well-known experiment that most persons have done in school. There are a number of vertical tubes of different shapes which communicate at the bottom by another tube. We fill it with water to a certain height:
Most persons would call this a system. If we add water to any vessel, there is a movement of water (a flow of matter) until the water has leveled out. There is also a flow of potential energy until each milligram of water on the surface has the same potential energy as any milligram on the surface of another tube. An increase or decrease of water in any tube affects the water in all other tubes according to well-known laws of physics.
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