IIT JAM Follow
May 30, 2020 5:45 pm 30 pts
Irreversibl e Work done Infinite free expansion Finite free expansion AT=0, AE =0 Pet = 0 P, #0, W =0, Q=0, AH - 0, PV =PV2 AT -0,AE =0 P 0. ext P 0, W =0, Q-0, AH =0.PV= P,V2 = -PextAV = -P, AV Where V, o Where V, =
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• Suman Kumar
Sweta did you understand this?
• Suman Kumar
Remember work is always done against Pext and if Pext is not given then P2 is taken.
• Suman Kumar
Infinite free expansion simply means vaccum.
• Suman Kumar
P1 and P2 is the pressure of the system before and after while Pext is the pressure of the surrounding. In finite process it is P2 which is non zero meaning Pressure of the system ...
Suman Kumar
As there is non zero pressure for finite process it can't expand to infinite volume as pressure holds it
• Shweta thakur
and sir infinite expansion means there is no opposing pressure means pressure is constant
• Shweta thakur
ok sir
Suman Kumar
Finite free expansion: it is clearly mentioned Pext =0
• Suresh khokhar
finite free expansion mean after expansion there will be some external pressure present .