Adiabatic gas Compression of Piston after Critical Point

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SUMMARY

The discussion centers on the behavior of a piston undergoing adiabatic gas compression beyond the critical point. Participants clarify that, after surpassing the critical point, the pressure does not decrease but remains high due to the indistinguishable nature of gas and liquid phases. The kinetic theory indicates that as compression continues, the system may experience electron degeneracy pressure, leading to a rapid increase in pressure with density. The consensus is that the pressure will not drop to zero but will instead remain constant or increase under these conditions.

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  • Understanding of adiabatic processes in thermodynamics
  • Familiarity with the critical point in phase transitions
  • Knowledge of kinetic theory of gases
  • Concept of electron degeneracy pressure
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MWRY
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Hello there,

Sorry, if there's a thread about this already.

Let's say if i have Piston which is fully insulated because as mentioned, it is an adiabatic compression. The pressure will increase as the volume of decrease. But what really happened when the system is compressed over the critical point. In pv diagram, will the pressure:

a. Remain constant
b. Increase exponentially
c. Decrease
d. drop to 0 in a straight line

The temperature is assumed to be not constant.
My idea would be 'c' or 'd' because of phase change from gas to liquid. However, I couldn't understand the kinetic theory behind it.

Thanks for any help.
 
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If you compress it enough, you will run into the regime of electron degeneracy pressure, where pressure increases quickly with density.

Why do you expect the pressure to decrease? Beyond the critical point, gas and liquid are identical, you have a high pressure (otherwise you are not beyond the critical point anyway) and temperature.
 

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