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### Explain the Laws of Perfect Gases?

:- Perfect Gas:- A perfect gas may be defined as a state of a substance, whose evaporation from its liquid state is complete. It may be noted that if its evaporation is partial, the substance is vapor.

The behavior of superheated vapors is similar to that of a perfect gas.

The physical properties of a gas are controlled by the following three variables:- 1) Pressure exerted by the gas, 2) Volume occupied by the gas, and 3) Temperature of the gas.

Laws of Perfect Gas:-

1. 1. Boyle’s Law:- This law was formulated by Robert Boyle in 1662. It states, “The absolute pressure of a given mass of a perfect gas varies inversely as its volume when the temperature remains constant.”
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2. Charles Law:- This law was formulated by Frenchman Jacques A.C. Charles in about 1787. It may be stated in two different forms.

(i) “The volume of a given mass of a perfect gas varies directly as its absolute temperature when the absolute pressure remains constant.”

(ii) “All perfect gases change in volume by 1/273 th of its original volume at 0 degree Celsius for every 1 degree Celsius change in temperature, when pressure remain constant.”

3. Gay – Lussac Law:- This law states, “The absolute pressure of a given mass of a perfect gas varies directly as its absolute temperature, when the volume remains constant.”