The general law of expansion or compression of a perfect gas
is

**PV**

^{n}= Constant
It gives the relationship between the pressure and volume of a
given quantity of gas. The value of

**n**depends upon the nature of the gas and condition under which the changes (i.e. expansion or compression) takes place. The value of**n**may be between zero and infinity. But the following values of**n**are important from the subject point of view:- When
**n=0**, then**PV**, i.e.^{0}= Constant**P = Constant**. In other words, for the expansion or compression of a perfect gas at__constant pressure__, n=0. - When
**n=1**, then**PV = Constant**, i.e. the expansion or compression is__iso-thermal__or hyperbolic. - When
**n**lies between**1**and**n**, the expansion or compression is polytropic, i.e**PV**.^{n}= Constant - When
**n=γ**, the expansion or compression is__adiabatic__, i.e**PV**.^{γ}= Constant - When
**n=∞**, the expansion or compression is at__constant volume__, i.e**V = Constant**.

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