IGNOU BCHCT 133 2026 - List the differences between thermodynamically reversible and irrevers

Question

List the differences between thermodynamically reversible and irreversible processes with the suitable examples Derive a relation between temperature and volume for an adiabatic process. $1.00\text{ mole}$ of helium gas at temperature of $100\text{ }^\circ\text{C}$ undergoes reversible adiabatic expansion from an initial volume of $5\text{ dm}^3$ to $30\text{ dm}^3$ . Calculate the final temperature of the gas by assuming that the helium behaves ideally and has

19 Jan 2026

Answer :

Word Count : 374

A thermodynamically reversible process is one that proceeds through a continuous series of equilibrium states and can be reversed by an infinitesimal change in conditions, leaving both the system and surroundings exactly as they were initially. It is an idealized process that occurs infinitely slowly, with no dissipative effects such as friction, viscosity, or finite temperature gradients. For example, the extremely slow isothermal expansion of an ideal gas in a perfectly frictionless piston-cylinder arrangement is considered reversible. In contrast, an irreversible process proceeds through non-equilibrium states and cannot be exactly reversed without leaving permanent changes in the system or surroundings. Such processes occur at a finite rate and involve dissipative effects like friction, turbulence, or sudden expansion. Free expansion of a gas into a vacuum and heat

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