Subject: Is 0K absolute zero and does absolute zero exist?

An instructor chided me for using the term "absolute" : she suggested that my 
label was inappropriate and should only be applied to things like the Kelvin 
scale...
hence my journey to find out more about the Kelvin scale.  I searched several 
FAQ sites but only came away more puzzled.  Knowing the basis of the Kelvin 
scale was "absolute zero", I concentrated my search on that... Worse...some
chemists argued that temps below 0 Kelvin were attained experimentally.  My 
first reaction was there must be a fault with the Kelvin scale- 0 K must not 
equal absolute zero (and felt quite smug).  However these folks continued to 
use "0 K" and "absolute zero" interchangeably. I'm confused...

I've heard all sorts of things about absolute zero: electrons would end up in 
the nucleus at this point... no further energy could be extracted from a 
system at absolute zero, etc... To top it all off, I've got some vague 
inklings that "absolute zero" could not exist for any system because of the 
equivalence of matter and energy and the uncertainty principle (a system having
matter has some energy and for a system at absolute zero one could 
theoretically describe it by posiiton alone). If my understanding is correct, 
the same might hold true of a vacuum because of quantum flux and virtual 
particles and ....
 WELL YOU SEE WHAT SORT OF KNOT I'VE TWISTED MYSELF INTO...YOUR HELP WOULD BE 
GREATLY APPRECIATED.
 THANKS.

Re: Is 0K absolute zero and does absolute zero exist?