why everything freeze at absolute zero?

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Offline rocking_1987

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why everything freeze at absolute zero?
« on: 17/08/2012 03:45:58 »
Hi,

I have one question about the absolute zero temprature. Why every matter on the earth cannot be further cool down than the absolute zero?

There are many things that can sustain thosands of degree temprature. Why the matters can go to such an extreme heating point while it takes only around 250 minus degree to freeze it completely?


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Offline flr

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Re: why everything freeze at absolute zero?
« Reply #1 on: 17/08/2012 05:42:32 »
The temperature is related to kinetic energy per degree of freedom.
At zero Kelvin the matter gets into the ground state, or a global minimum of kinetic energy.
How can something get lower than its (global) minimum?
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Note that there is 'motion' at 0K, for example the kinetic energy of a quantum harmonic oscillator  is not zero in groundstate.

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Offline Bored chemist

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Re: why everything freeze at absolute zero?
« Reply #2 on: 17/08/2012 18:33:44 »
Unless it's under rather high pressure, helium doesn't freeze at absolute zero.
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Offline yor_on

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Re: why everything freeze at absolute zero?
« Reply #3 on: 17/08/2012 23:36:06 »
You have the Heisenberg uncertainty principle, and as that doesn't allow fixed parameters for all properties simultaneously you still get a sort of 'motion', and one that you can't pass as I read it?
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