1. The problem statement, all variables and given/known data Hi ! I'm stuck with these two questions of my assignment of thermodynamics - Give two exemples of irreversible process (initial state, process, final state) - For each of them, explain why they are irreversible on the microscopic scale. 2. Relevant equations We are not asked any calculations here. I only need to describe with a few sentences. 3. The attempt at a solution irreversible process => exemple : An engine (?) There's an irreversible process because of the Joule heating and frictions.