# Can i expand non-ideal gas reversibly isomermally?

• kntsy
In summary, the conversation discusses the possibility of expanding an ideal gas and a non-ideal gas isothermally and reversibly. It is mentioned that this is possible in theory as long as there is an infinite heat capacity reservoir and the expansion is done very slowly. It is also noted that the first and second laws of thermodynamics are not dependent on the type of matter involved.
kntsy
Suppose we expand the ideal gas reversibly isomermally from V1 to V2 at T, can i expand non-ideal gas reversibly isomermally from V1 to V2 at T

kntsy said:
Suppose we expand the ideal gas reversibly isomermally from V1 to V2 at T, can i expand non-ideal gas reversibly isomermally from V1 to V2 at T
The first and second laws of thermodynamics do not depend on the matter involved.

In theory, you could expand a non-ideal gas or any substance isothermally and reversibly. All you need to do is have an infinite heat capacity reservoir.

AM

Andrew Mason said:
All you need to do is have an infinite heat capacity reservoir.

You also need to expand it REEEEALLLY slowly...

## 1. Can non-ideal gases be expanded reversibly isothermally?

Yes, non-ideal gases can be expanded reversibly isothermally, but it is difficult to achieve in practice. This is because non-ideal gases do not follow the ideal gas law, which means their behavior cannot be predicted accurately and they may exhibit more complex behaviors such as phase changes or chemical reactions.

## 2. What is the difference between reversible and irreversible expansion of a non-ideal gas?

Reversible expansion is a process in which the gas expands slowly enough for its internal energy to remain constant. This means that the expansion is isothermal and the gas can be returned to its original state without any loss of energy. On the other hand, irreversible expansion is a rapid process in which the gas's internal energy changes, usually due to a sudden change in pressure or volume.

## 3. Can non-ideal gases be expanded isothermally without any change in internal energy?

No, this is not possible. Non-ideal gases cannot be expanded isothermally without any change in internal energy because their behavior is more complex than ideal gases. Even in a reversible expansion, there may be small changes in internal energy due to factors such as intermolecular forces or chemical reactions.

## 4. What is the significance of isothermal expansion for non-ideal gases?

Isothermal expansion is important for non-ideal gases because it allows for a more accurate understanding of their behavior. By keeping the temperature constant, the effects of temperature on a gas's behavior are eliminated, and the focus can be on other factors such as intermolecular forces or chemical reactions.

## 5. Can non-ideal gases be expanded isothermally and reversibly in real-life applications?

It is difficult to achieve isothermal and reversible expansion of non-ideal gases in real-life applications. This is because it requires precise control and slow changes, which are not always practical or possible. Real-life applications often involve rapid changes in pressure and volume, which can lead to irreversible expansion and changes in internal energy.

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