Closed system

From Freepedia

An open system can be influenced by events outside of the declared boundaries of the system. A closed system is self-contained: outside events are separated from the system. The total energy of the system stays the same; there is no input or output of energy, just transferrence within.

In practice many things are a mixture of the two. For example, a government is a closed system when it seeks to maintain confidentiality. However, it is open when it seeks advice and accepts universal voter input and petitions.

Dynamic systems have components and/or flows that change over time.

Compare to Isolated physical system.