begin mathsize 36px style fraction numerator P subscript 1 V subscript 1 over denominator T subscript 1 end fraction equals fraction numerator P subscript 2 V subscript 2 over denominator T subscript 2 end fraction end style

P1= Initial Pressure ; V1 = Initial Volume ; T1 = Initial Temperature ; P2 = Final Pressure ; V2= Final Volume ; T2 = Final Temperature

P1

V1

T1

P2

V2

T2

 
This is a combination of three gas laws, which are Boyle's law , Charles's law and Gay Lussac's law. This can also be derived from the ideal gas law. In other words , the three said laws can also be obtained from this equation by simply assuming a property (volume , pressure or temperature) to be constant.     

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