## Reversible and Irreversible

$\Delta U=q+w$

Naana Boateng 1I
Posts: 58
Joined: Fri Sep 29, 2017 7:07 am

### Reversible and Irreversible

Is there an easier explanation to describe when a system is reversible or irreversible?

Sue Xu 2K
Posts: 58
Joined: Fri Sep 29, 2017 7:06 am

### Re: Reversible and Irreversible

The way works for me is to simply think that reversible expansion is a slow, equilibrium process, and the changes of pressure happen in a lot of small steps. For the irreversible expansion, the pressure changes in one step and stays there for the rest of the process.

Abel Thomas 2C
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Joined: Fri Sep 29, 2017 7:06 am
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### Re: Reversible and Irreversible

Another way to think about it is, for a reversible process, the system is always in equilibrium with its surroundings. For an irreversible process, on the other hand, there will always be an entropy change.

Harrison Wang 1H
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: Reversible and Irreversible

For a reversible process, pressure inside and outside of the system will be equal. For an irreversible process, there will be a significant difference between the pressure inside and outside of the system.

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