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nature : In order to facilitate research between different forms of energy conversion and transmission of, and often the research object interrelated parts or all off, such as being separated from the object of research thermodynamics, called thermal system, or system or systems. Around the outside as part of the outside world. System and the external interface known as Boundary or control surfaces. Through the system side interface with the outside world for energy and material exchange. While the PC interface, it is also true there can be a fictional scenario, it can be fixed may be changes, but the system should meet so that the average statistics of the limited scope of the law. According to the interaction with the outside world between different systems can be divided into : (a) closed system (or quality control system), refers to systems with the outside world without quality exchange; (2) open system (or volume control system), is a system with the outside world refers to the existence and quality of energy exchange; (3) thermal insulation system is the system with the outside world means no heat exchange; (4) isolation system, the system is with the outside world does not exist and quality of energy exchange. Also according to composition and phase differences can be divided into single component or multi-component system and single-phase system (or Uniform System) or multiphase systems (or non-uniform system).
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