Systems & Surroundings
There are three classifications of a system and its surroundings: an open system, a closed system, and an isolated system.
In thermodynamics, a system must be able to be defined by thermodynamic variables such as temperature, entropy, and pressure (Wikipedia). The surroundings are the things outside the system.
An open system is a system that exchanges both mass and energy with its surroundings (Wikipedia). A closed system is one that exchanges energy with its surroundings but not mass (Wikipedia). An isolated system is one that can not exchange neither energy or mass with its surroundings (Wikipedia).
Open and Closed Systems
Want more videos like this? Click here to see more on systems and their surroundings.