Has absolute zero ever been proved?

  • 3 Replies
  • 1845 Views

0 Members and 1 Guest are viewing this topic.

*

Offline bizerl

  • Sr. Member
  • ****
  • 279
    • View Profile
Has absolute zero ever been proved?
« on: 16/07/2012 02:16:32 »
I'm wondering whether "absolute zero" is a calculated conclusion, or an observable phenomenon. If it is the latter, how is it observed?

*

Offline Bored chemist

  • Neilep Level Member
  • ******
  • 8848
    • View Profile
Re: Has absolute zero ever been proved?
« Reply #1 on: 16/07/2012 19:43:09 »
The calculations show that it's impossible to get there so it cannot be observed.
Please disregard all previous signatures.

*

Offline bizerl

  • Sr. Member
  • ****
  • 279
    • View Profile
Re: Has absolute zero ever been proved?
« Reply #2 on: 19/07/2012 04:25:11 »
So it's more like an asymptotal target? - We can get ever closer but never quite there?

*

Offline evan_au

  • Neilep Level Member
  • ******
  • 4310
    • View Profile
Re: Has absolute zero ever been proved?
« Reply #3 on: 21/07/2012 12:38:39 »
Yes - You can get closer and closer by expending more and more energy, but you can never quite get there.
For many years, scientists have observed some characteristics that appear close to absolute zero, including superconductivity and superfluidity.

The current record (in 2012) is less than a billionth of a degree above absolute zero.
This close to absolute zero, Bose-Einstein condensates have been created, where most of the atoms are at their lowest energy level, even though some of the atoms still have some higher energy. http://en.wikipedia.org/wiki/Absolute_zero#Relation_with_Bose.E2.80.93Einstein_condensates

According to Quantum Theory, you can never remove all of the energy from a system.