Question

Thermodynamic

What is the different between quasiequilibirum and reversible process? Give example?

Answer 1

In quasi-equilibirum process system will deviate from equilibrium by a infinitely small amount. A typical example for this is gas in a piston and cylinder. When piston moves very slowly gas gets compressed very slowly. As a result pressure inside the cylinder will be nearly uniform. So the system never deviate from equilibrium much.

A reversible process is the process that can be reversed. it has to be noted that reversible process will not leave any trace on the surroundings. In other words both system and surroundings will return to initial state at the end of the reversible process.Reversible process will not occur naturally. But we will use reversible concept because it is easy to analyse.Factors like friction, heat transfer, chemical reaction and all make the process irreversible. Examples of nearly reversible process are :

• frictionless relative motion
• expansion and compresion of spring.

Any reversible process are quasi-equilibrium processes. . However, quasi equilibrium processes involving entropy production are not reversible.

I just made it to the point and brief for better understanding. If you need more info on this feel free to comment. I will reply ASAP.

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