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 -- by Rocket to the Moon, by Airplane to the Rocket, by Taxi to the Airport, by Frontdoor to the Taxi, by throwing back the blanket and laying down the legs ... - They Might Be Giants
