- #1
hyperickz
- 4
- 0
We all know that in free expansion of gases under adiabatic condition and keeping the temperture constant ,we get that no work is done by the gas.Moreover since del(Q)=0, del(U)=0 according to first law of thermodynamics.But we get a increase of entropy by an amount Rln2.Now the question is that from where does the unavailable energy associated with entropy i.e. Tdel(S)=RTln 2 comes from ?