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Re: [Phys-l] Fwd: CMNS: Schrodinger pressure



On 06/26/2009 07:38 AM, chuck britton wrote:

Back in the 'bad' old days - every pressure was associated with a force.

Really? Was it ever that bad?

I don't see any fundamental force that was ever associated with
the pressure of an ideal gas Fundamentally, this pressure is
associated with (i.e. is the derivative of) the kinetic energy
of the gas. Neither kinetic energy nor its derivative is listed
among the usual "fundamental" interactions.

All the same words apply to degeneracy pressure, which tells
us there is nothing very special about degeneracy pressure.

For details on this, see
http://www.av8n.com/physics/degeneracy.htm

And there were 'Four' fundamental forces.

Slowly, but surely these forces are being reduced in number as they
are 'Unified'.

Which 'Force' would one tell an enquiring student that the
_degeneracy pressure_ is to be associated with?

It only applies to spin 1/2 (and integer + 1/2) particles - so is the
E&M force a good guess?

Not a good guess. The EM field (i.e. the photon) is spin 1. It's a
boson. Otherwise lasers wouldn't be possible.


Bosonic systems can be degenerate, but they're not going to produce
degeneracy pressure the way fermionic systems do. They're more likely
to produce a superfluid or superconductor.