2.1.3 process(过程) Constant-temperature process:a process in which a system changes from an initial state to a final state at a constant temperature.T=T2=T Constant-pressure process:p-p2=P Constant-volume process:V=12=V Reversible process? a process that can be "reversed"by means of infinitesimal changes in some property of the system without loss or dissipation of energy. Due to these infinitesimal changes,the system is in thermodynamic equilibrium throughout the entire process.Since it would take an infinite amount of time for the reversible process to finish,perfectly reversible processes are impossible2.1.3 process(过程 ) Constant-temperature process：a process in which a system changes from an initial state to a final state at a constant temperature. T1 = T2 = T Constant-pressure process：p 1 =p 2 =P Constant-volume process：V1 = V2 = V Reversible process? a process that can be "reversed" by means of infinitesimal changes in some property of the system without loss or dissipation of energy. Due to these infinitesimal changes, the system is in thermodynamic equilibrium throughout the entire process. Since it would take an infinite amount of time for the reversible process to finish, perfectly reversible processes are impossible