-2
$\begingroup$

Does helium freeze at absolute zero? In theory, it should, since all random motions of particles stops at absolute zero, right?

$\endgroup$
  • $\begingroup$ It actually doesn't. I'm not talking about ordinary pressures, I'm talking about absolute zero at any pressure. $\endgroup$ – The_CIA Oct 27 at 3:14
4
$\begingroup$

Not at atmospheric pressure. You need at least 25 atmospheres pressure to solidify helium-4 and at least 29 atmospheres (0.3 K) for helium-3. See Wikipedia.

At low pressure you fail to solidify the helium because of weak interatomic interactions combined with quantum mechanical zero point energy. Higher pressure favors forming a denser structure with an ordered lattice arrangement, thus a crystalline solid.

| improve this answer | |
$\endgroup$

Not the answer you're looking for? Browse other questions tagged or ask your own question.