Re: [curiosa] Re: Debian Centre of Mass
On Sat, Jul 07, 2001 at 07:29:17PM +0200, Martin F. Krafft wrote:
> also sprach vdongen (on Sat, 07 Jul 2001 06:51:48PM +0200):
> > minus 40 kelvin ....
> > ok....at 0 K ....al motion stops.....so at -40 all parts are moving in
> > a negative direction, but they are still moving....at about the same
> > speed as +40 K.......so -40 K is warmer then 0 K
>
> huh?
> nonono, it is physically impossible for *anything* to go colder than
> 0K *because* all particles stop moving. kinetic energy (i.e.
> temperature) doesn't care about the sign of the velocity (i.e. the
> direction) since it's squared anyway.
For a system to have negative kinetic energy,
the particles just need to have imaginary speed...
-S
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