➠ The thermodynamic system (or simply known as system) may be broadly defined as a definite area or space where some thermodynamic process is taking place.
➠ It may be noted that a thermodynamics system has its boundaries and anything outside the boundaries is called surroundings.
➠ A system is a finite quantity or a prescribed region of space.
➠ The actual or imaginary area enclosing the system is called boundary of the system.
➠ The boundary may be fixed or it may move as and when a system containing a gas is compressed or expanded.
➠ The boundary may be real or imaginary.
➠ It is not difficult to see a real boundary but an an example of imaginary boundary would be one drawn around a system consisting of the fresh mixture about to enter the cylinder of an I.C Engine together with the remnants of the last cylinder charge after the exhaust process.
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