Re: [Phys-l] tiny bubbles

[John Denker <jsd@av8n.com>]

On 09/17/2006 05:25 PM, Bernard Cleyet wrote:
> Is a super fluid, at non zero T, a mixture of super and normal, or is 
> this just a convenient model?  

I suspect this is about terminology, not so much about models.

If you have a bottle of superfluid, the stuff in the bottle is "the"
superfluid.  The superfluid has a superfluid fraction (sff) and a
normal-fluid fraction (nff).  The superfluid fraction is not "the"
superfluid, but only a fraction thereof.

The stuff in the bottle is what it is, and does what it does.  The
model is a perfectly fine model, as models go ... but of course the
model does not tell the whole story.

> would the "zero point" motion still make 
> homogeneous fluid impossible?

Yes.

Crystals have zero-point motion, too.