What volumes are equal to tv irv erv rv?

In thermodynamics, the volumes tv (total volume), irv (internal reversible volume), erv (external reversible volume), and rv (real volume) can be equal under specific conditions, typically when the system is in equilibrium. These equalities often occur in idealized scenariOS or during certain processes where the state of the system does not change. However, in practical applications, these volumes may differ due to factors like pressure, temperature, and the nature of the substance.