Kindly explain with more details & example point number 3 that how is this possible that process decreases internal energy of the system .

Hello Nikhil, as you would know, that dU=TdS-PdV then in isentropic and isochoric process dS=0 and dV=0 then dU=0,i.e, U should be minimum. I hope it helps

dU=TdS-PdV, so if dS=0, dV=0 then dU=0, i.e, U is minimum

Dear Nikihi,

Greetings!!

As per your query, every system wants to achieve stability that is why it decreases its internal energy.

Thank you fo...