# Reversible and irreversible processes in thermodynamics pdf

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Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up. What difference between the two processes in molecular level is responsible for this change?

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## Entropy of reversible and irreversible processes

The basic difference between reversible and irreversible processes is that in the reversible process the system remains in thermodynamic equilibrium, while in the irreversible process the system does not remain in thermodynamic equilibrium. In the reverse process, the system passes through the same stages as in the direct process but thermal and mechanical effects at each stage are exactly reverse. If heat is absorbed in the direct process, it will be given out in the reverse process. Similarly, if work is done by the system in the direct process, work will be done on the system in the reverse process. Hence the system will restore to the original state. The phenomenon of undergoing reversible change is also called reversibility. In actual practice the reversible process never occurs, thus it is an ideal or hypothetical process.

Figure 1. The ice in this drink is slowly melting. Eventually the liquid will reach thermal equilibrium, as predicted by the second law of thermodynamics. There is yet another way of expressing the second law of thermodynamics. This version relates to a concept called entropy. By examining it, we shall see that the directions associated with the second law—heat transfer from hot to cold, for example—are related to the tendency in nature for systems to become disordered and for less energy to be available for use as work.

In thermodynamics , a reversible process is a process whose direction can be reversed to return the system to its original state by inducing infinitesimal changes to some property of the system's surroundings. Having been reversed, it leaves no change in either the system or the surroundings. Since it would take an infinite amount of time for the reversible process to finish, perfectly reversible processes are impossible. However, if the system undergoing the changes responds much faster than the applied change, the deviation from reversibility may be negligible. In a reversible cycle , a cyclical reversible process, the system and its surroundings will be returned to their original states if one half cycle is followed by the other half cycle.

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Hello readers, in this article, we will be going to see the Difference between Reversible Process and Irreversible Process in Thermodynamics and I hope you can clear this concept by reading this paper. So before jumping into the differences, let me give you the general idea of What is Reversible and Irreversible processes in thermodynamics. Reversible Process is a process that can be made to exactly replace its path without suffering any deviation. An irreversible process is a process that cannot be made to exactly retrace its path without suffering its deviation is called an irreversible process.

Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. It only takes a minute to sign up. I asked the professor what the issue is with the answer, and she could not articulate a clear reason, and eventually said she'll re-think it. In a reversible process, at each point along the process path, the system is only slightly removed from being in thermodynamic equilibrium with its surroundings. So the path can be considered as a continuous sequence of thermodynamic equilibrium states.

One of the most important notions of thermodynamics is the notion of reversible and irreversible processes. A thermodynamic process is defined as a totality of continuously changing states of a thermodynamic system. Two processes can be imagined to develop along the same path between any two states 1 and 2 of a system: from state 1 to state 2 and vice versa, from state 2 to state 1 , the so-called forward and reverse processes.

### Difference between reversible and irreversible process in thermodynamics

When the system undergoes a change from its initial state to the final state, the system is said to have undergone a process. During the thermodynamic process, one or more of the properties of the system like temperature, pressure, volume, enthalpy or heat, entropy, etc. The second law of thermodynamics enables us to classify all the processes under two main categories: reversible or ideal processes and irreversible or natural processes. The process in which the system and surroundings can be restored to the initial state from the final state without producing any changes in the thermodynamics properties of the universe is called a reversible process. In the figure below, let us suppose that the system has undergone a change from state A to state B.

Внутри клубились тучи черного дыма. Все трое как завороженные смотрели на это зрелище, не лишенное какой-то потусторонней величественности. Фонтейн словно окаменел. Когда же он пришел в себя, его голос был едва слышен, но исполнен решимости: - Мидж, вызовите аварийную команду. Немедленно. В другой стороне комнаты зазвонил телефон. Это был Джабба.