What is Thermodynamic system?
{{no sources|date=November 2024}} {{notsimple|date=November 2024}} In [[thermodynamics]], a '''thermodynamic system''', originally called a ''working substance'', is defined as that part of the [[universe]] that is under consideration. ==Theory== A real or imaginary boundary separates the system from the rest of the universe, which is referred to as the environment or surroundings – sometimes called a reservoir. A useful classification of thermodynamic systems is based on the nature of the boundary and the [[Quantity|quantities]] flowing through it, such as [[matter]], [[Scientific energy|energy]], [[Work (physics)|work]], [[heat]] and [[entropy]]. A system can be anything. For instance, a [[Cylinder (engine)|cylinder]], a [[solution]] in a [[test tube]], a living [[organism]] or a [[planet]] etc. {{tech-stub}} [[Category:Physics]] [[Category:Systems]] [[Category:Systems theory]] [[Category:Thermodynamics]]