Adiabatic gas Compression of Piston after Critical Point

AI Thread Summary
In adiabatic gas compression beyond the critical point, the behavior of pressure is influenced by the phase change from gas to liquid. The pressure does not remain constant and is expected to increase due to the unique properties of the supercritical fluid state. The discussion highlights that at this stage, gas and liquid phases become indistinguishable, leading to complex pressure dynamics. The concept of electron degeneracy pressure is introduced, indicating that pressure can rise rapidly with increasing density. Understanding these principles is essential for accurately predicting the system's behavior during compression.
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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