> [!summary] Closed systems are systems in which energy cannot flow in or out of. >[!info]+ Read Time **⏱ 1 min** # Definition A closed system refers to a system (a part of something that is chosen to analyze) in which energy cannot escape or enter. # Resources <iframe width="560" height="315" src="https://www.youtube.com/embed/ROBkMqJQLr4?si=Tw1CQiBd6eEKmlBe" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>