Polytropic process is the most commonly used process in practice. In this, the thermodynamic process is said to be governed by the law PVn = constant where n is the index which can vary from – ∞ to + ∞. Figure 3.6 shows some typical cases in which the value of n is varied and the type of process indicated for different values of n. Thus the various thermodynamics processes discussed above are special cases of polytropic process.
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