Non-quasistatic process. Constant pressure.Work cero.

In summary, in a non-quasistatic process, the work is not necessarily equal to zero, as it depends on the volume and the definition of pressure. However, if the process is quasistatic, the work done by the gas will be zero if the volume remains constant. This concept is important in understanding the relationship between pressure, volume, and work in thermodynamics.
  • #1
Phyba
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If in a non-quasistatic process the pressure is constant, is the work necessarily equal to cero?
I have from the notes taken in class that it must be 0, but I don't really see why, so I'm not sure whether maybe I didn't hear it well.
I haven't really started to work with non-quasistatic processes yet; we were just given the definition of quasistatic process the other day.

Thanks!
 
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  • #2
Phyba said:
If in a non-quasistatic process the pressure is constant, is the work necessarily equal to zero?
No. The work is zero if the volume is constant. The work done by the gas at constant pressure is ##P \Delta V##, but P is defined only if the process is quasistatic.
The work done on the gas by the surrounding atmosphere at pressure P is ## - P \Delta V##.

ehild
 

FAQ: Non-quasistatic process. Constant pressure.Work cero.

What is a non-quasistatic process?

A non-quasistatic process is a thermodynamic process that occurs at a finite speed, where the system does not have enough time to reach thermal equilibrium at every point during the process.

How is a non-quasistatic process different from a quasistatic process?

A non-quasistatic process is different from a quasistatic process in that it occurs at a finite speed and does not have enough time to reach thermal equilibrium at every point, while a quasistatic process occurs slowly enough for the system to reach thermal equilibrium at every point.

What is the significance of constant pressure in a non-quasistatic process?

In a non-quasistatic process, constant pressure is a constraint that is placed on the system. This means that the system is not allowed to expand or contract during the process, and any work done on or by the system must occur at this constant pressure.

How is work defined in a non-quasistatic process with constant pressure?

In a non-quasistatic process with constant pressure, work is defined as the product of the constant pressure and the change in volume of the system. This means that work is only done when there is a change in volume, and the direction of work depends on the direction of the change in volume.

Can a non-quasistatic process with constant pressure have zero work?

Yes, a non-quasistatic process with constant pressure can have zero work if there is no change in volume. This means that the system is not expanding or contracting, so no work is being done on or by the system.

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