CPB 314 Lecture 2: CPB 314 (2)
9 Mar 2017
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Document Summary
System: a quantity of matter or a region in space chosen for study. Surroundings: the mass or region outside the system. Boundary: the real or imaginary surface that separates the system from its surroundings. The boundary of a system can be fixed or movable. Systems may be considered to be closed or open. Closed system (control mass): a fixed amount of mass, and no mass can cross its boundary. (special case is isolated system. ) Open system (control volume): a properly selected region in space. It usually encloses a device that involves mass flow such as a compressor, turbine, or nozzle. Both mass and energy can cross the boundary of a control volume. Control surface: the boundaries of a control volume. Some familiar properties are pressure p, temperature t, volume v, and mass. Properties are considered to be either intensive or extensive. Intensive properties: those that are independent of the mass of a system, such as temperature, pressure, and density.
