Reversible process and irreversible process(可逆过 程和不可逆过程) If a process is reversible: 1.No mechanical energy can be lost due to friction,or other dissipate forces that produce heat. 2.there is no heat conduction due to the temperature difference 3.the process is a quasi-static one. Reversible process and irreversible process（ 可逆过 程和不可逆过程） If a process is reversible: 1. No mechanical energy can be lost due to friction, or other dissipate forces that produce heat. 2.there is no heat conduction due to the temperature difference 3.the process is a quasi-static one