Which term describes a system that prevents any movement into and out of the system?

Which term describes a system that prevents any movement into and out of the system?

• A. Open System
• B. Closed System
• C. Open Boundary
• D. Isolated System

Answer: (B)

Think about how a system interacts with its surroundings. If nothing moves into or out of the system, there is no exchange of anything with the outside environment—neither matter nor energy crosses the boundary. That's what an isolated system represents: complete separation from the surroundings with no transfer across the boundary. In contrast, a closed system stops the transfer of matter but can still exchange energy (like heat or work) with its surroundings, so it isn’t completely isolated. An open system allows both matter and energy to cross the boundary, and an open boundary describes a boundary that permits such transfer. So, the term that best describes a system with no movement into or out is isolated.

Think about how a system interacts with its surroundings. If nothing moves into or out of the system, there is no exchange of anything with the outside environment—neither matter nor energy crosses the boundary. That's what an isolated system represents: complete separation from the surroundings with no transfer across the boundary.

In contrast, a closed system stops the transfer of matter but can still exchange energy (like heat or work) with its surroundings, so it isn’t completely isolated. An open system allows both matter and energy to cross the boundary, and an open boundary describes a boundary that permits such transfer.

So, the term that best describes a system with no movement into or out is isolated.