Sun September 18, 2011 By: Abhishek Poonia

Explain me types of system with definition and in detail

Expert Reply
Mon September 19, 2011

A thermodynamic system is a quantity of matter of fixed identity, around which we can draw a boundary, the boundaries may be fixed or moveable. Work or heat can be transferred across the system boundary. Three types of thermodynamic systems are distinguished depending on the kinds of interaction and energy exchange taking place between the system and its surrounding environment:

1. Isolated systems: are completely isolated in every way from their environment. They do not exchange heat, work or matter with their environment. An isolated system is more restrictive than a closed system as it does not interact with its surroundings in any way. Mass and energy remains constant within the system, and no energy or mass transfer takes place across the boundary. An example of an isolated system would be an insulated rigid container, such as an insulated gas cylinder.

2. Closed systems: are able to exchange energy (heat and work) but not matter with their environment. Whether a system exchanges heat, work or both is usually thought of as a property of its boundary. One example of closed system is fluid being compressed by a piston in a cylinder.

3. Open systems: exchanging energy (heat and work) and matter with their environment. A boundary allowing matter exchange is called permeable. The ocean would be an example of an open system.

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