A closed system, it will live in the computer by itself.

The amount of energy in a closed system is always the same.

The result is that we have created a closed system.

It is not easy to create a closed system to account for all of the energy.

The other form of energy transfer between closed systems is as heat.

Closed systems, on the other hand, are considered to be isolated from their environment.

Island's closed system is bad for investors in two ways.

Closed systems are able to exchange energy (heat and work) but not matter with their environment.

He said that blood was pumped around the body in a closed system.

After that, the body was regarded as a closed system.