Solving the Most Complex AITS Problem on Irreversible Processes | Heat & Thermodynamics

[@darshverma1440]

Nice

[@basics1729]

Thanks 👍

[@r4music220]

example of internally reversible externally irreversible process?

[@basics1729]

Suppose you are having a similar but not exact scenario as in the question above in which a piston-cylinder arrangement is there and the gas within the cylinder is expanding but very very slowly thus undergoing a quasi-static process. But at the same time it is also transferring heat to the surrounding because of finite temperature difference with the surroundings. This is the case (although very bookish) of internally reversible but externally irreversible process. If the temperature difference with the surroundings are to be infinitesimally small too, then the process would have been externally reversible also. This is the complete definition of a reversible process having both internal and external reversibility involved.

[@r4music220]

@@basics1729 oh got it thanks

[@sukhjotsingh799]

Energy conservation se keh skte h ? Ki initial energy of gas = final energy of gas + potential energy gained

[@basics1729]

Yes, but here you can say that the internal energy lost by the gas is helping piston to do the work against gravity. You cannot apply Energy Conservation (1st Law of Thermodynamics) directly to the gas itself.