Various gas laws were given time to time to explain the behaviour of gases.

**1.**__ Boyle’s law: __The volume of given mass of a gas is inversely proportional to pressure at constant constant temperature.

V~1/P

or PV=constant

2. __Charles law: __The volume of given mass of a gas is directly proportional to absolute temperature at constant pressure.

V~T (at constant mass and P)

Or V/T=constant

3.__ Gay-Lussacs law or pressure temperature law: __The pressure of a given mass of a gas is directly proportional to temperature at constant volume.

P~T

Or P/T=constant

3.__The Gas equation: __

PV=RT for one mole of gas

And PV=nRT For n mole of gas

Since n=w/m

PV=wRT/m

Where R is molar gas constant, w is weight of gas and m is molecular weight of gas.

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