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2016-07-03T18:45:46+08:00
Economic system Open vs. Closed Systems

Systems can be either open or closed. A closed system is one where a quantity or series of quantities cannot enter or leave the system. For example, a system might be closed to energy, meaning energy might not be able to enter or leave the system. A vacuum thermos flask does a really good job of stopping energy from leaving the system to keep your drink warm. So it might make sense to treat it as a closed system - but no system in the real world is ever perfectly closed, so it will only be an approximation.

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