Adiabatic gas Compression of Piston after Critical Point

In summary, the conversation discusses the behavior of a system being compressed over the critical point on a pv diagram. The options for the resulting pressure are discussed, with the idea that it may decrease due to a phase change from gas to liquid. However, the concept of electron degeneracy pressure is also mentioned, which can cause pressure to increase quickly with density. The question of why pressure is expected to decrease beyond the critical point is also addressed, with the reminder that gas and liquid are identical beyond this point and have high pressure and temperature.
  • #1
MWRY
3
0
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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  • #2
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.
 

Related to Adiabatic gas Compression of Piston after Critical Point

What is adiabatic gas compression?

Adiabatic gas compression is a process in which the temperature and pressure of a gas change without any heat exchange with the surroundings. This is typically achieved by compressing the gas rapidly and is often used in industrial and engineering applications.

What is the critical point of a gas?

The critical point of a gas is the temperature and pressure at which the gas can no longer exist in a liquid state, regardless of the applied pressure. At this point, the gas and liquid phases have the same density and are indistinguishable from each other.

What happens to a gas during adiabatic compression after the critical point?

After the critical point, the gas will experience a rapid increase in temperature and pressure as it is compressed. This is due to the gas being in a supercritical state, where it exhibits properties of both a gas and a liquid.

What is the purpose of adiabatic gas compression after the critical point?

The purpose of adiabatic gas compression after the critical point is to increase the density of the gas, making it more suitable for storage or transportation. This process is commonly used in the oil and gas industry to transport natural gas in pipelines.

What are the potential hazards of adiabatic gas compression after the critical point?

There are several potential hazards associated with adiabatic gas compression after the critical point, including the risk of explosion due to the high temperatures and pressures involved. It is important to carefully monitor and control the compression process to ensure safety and prevent accidents.

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