# Answer to Question #9090 in Molecular Physics | Thermodynamics for Homa mohammadi

Question #9090

about calculating work in a piston cylinder ..

the process is reversible and we can use -pdv formula for calculating work when P(ext)=p(gas) but for instance when the pressure of the gas change from P1 to P2 how P(gas) will be equal to P(ext)?

we should change P(ext) trough the process from P1 to P2 too ?

the process is reversible and we can use -pdv formula for calculating work when P(ext)=p(gas) but for instance when the pressure of the gas change from P1 to P2 how P(gas) will be equal to P(ext)?

we should change P(ext) trough the process from P1 to P2 too ?

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