I Two Entropy scenarios on a system

[MatthewKM]

TL;DR Summary

Entropy, Brownian motion, volume vs temperature thought experiment

Entropy question.

Take a finite number of identical atoms in a specific volume of space at a moment of time.

Run two thought experiments on this system

scenarios (both time independent)

1: expand the volume of space of the system instantaneously by a factor of 10. The fixed number of atoms in the system have not, in that instant, yet reduced (or increased) their individual kinetic energies but the vacuum pressure has reduced in the system concordant with the increase in volume.

2: Instantaneously reduce the kinetic energy of all the atoms in the system uniformly without changing the volume of the system such that the total heat in this system is equal to scenario #1 concordant with Avogadro’s law

Are either of these two impossible scenarios both unique descriptions of entropy increasing according to the second law of thermodynamics or is entropy an entanglement of these two scenarios?

 

[PeterDonis]

the vacuum pressure

What "vacuum pressure"? What are you talking about?

Instantaneously reduce the kinetic energy of all the atoms in the system

This is, as you admit, impossible.

Are either of these two impossible scenarios both unique descriptions of entropy increasing according to the second law of thermodynamics or is entropy an entanglement of these two scenarios?

None of the above. Asking about impossible scenarios is pointless; you can't ask the laws of physics to tell you what happens in a scenario that violates the laws of physics. That's nonsense.

 

[MatthewKM]

Yes impossible I totally agree. Vacuum pressure? with this impossible question part of the impossibility of the question is that the measure of vacuum is determined by the energy of the particles within so I was trying to address this in the question by referring to vacuum in that context. The thrust of the question is to try to parse entropy into two different effects or states. Uniformity of the distribution of particles and energy of those particles That's all. Of course I know it is an impossibility I said that at the outset. Didn't intend to make anyone angry

 

[PeterDonis]

the measure of vacuum is determined by the energy of the particles within

I have no idea what you mean by this or where you are getting it from.

The thrust of the question is to try to parse entropy into two different effects or states. Uniformity of the distribution of particles and energy of those particles

I have no idea where you are getting this from either. I think you need to find an actual reference (textbook or peer-reviewed paper) that discusses entropy and frame a question based on that instead of trying to make up impossible scenarios yourself.

Of course I know it is an impossibility I said that at the outset.

And, as I said, it is pointless to discuss impossible scenarios since the laws of physics can't tell us anything about them.

Didn't intend to make anyone angry

I don't know where you are getting the idea that anyone is angry. I am simply pointing out to you that the question you have posed is unanswerable as you posed it, and explaining why.

 

[PeterDonis]

The OP question is unanswerable since it postulates scenarios that are impossible according to the laws of physics.

Thread closed.