# If process is reversible then area under PV graph gives work done but if process is Irreversible area below PV graph give work done .why?

Eshan
4 years ago
Dear student,

It does not matter if a process is reversible or irreversible. This relation$\dpi{80} dW=PdV$is general because it is derived for any compression under some applied pressure as-

$\dpi{80} dW=F.ds=(PA).ds=P(AdS)=PdV$