According to Wikipedia, superfluid helium can be restricted in a container with pores <0.7nm in diameter.

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Europa has a thick layer of ice, maybe a few or several miles thick, under which is a very deep liquid ocean, but "its bulk density suggests that it is similar in composition to the terrestrial planets, being primarily composed of silicate rock." According to the researchers, "GJ1214b’s radius could be explained by a bulk composition consisting of an ice-rock core surrounded by a H/He/H₂O envelope that has a water mass fraction of 50-85%."

GJ1214b is a giant ball of water 2.7 times the Earth's diameter (Uranus is about 4 times, Saturn about 9). The water must be (tens of) thousands of miles deep. There's nothing like it in our system. I can't even begin to imagine what happens to water at that kind of depth and pressure. What bizarre properties it must have. They mention superfluids and hot ice in the article, but I suspect it's even weirder.
>> ^gwiz665:
Isn't Europa actually made almost entirely of ice? Europa the moon around Jupiter, I believe.
http://en.wikipedia.org/wiki/Europa_%28moon%29

Thanks, I'll check it out. Read some stuff about it, it's bizarre. Hope this sheds some light on it.

In reply to this comment by mauz15:
Since you posted http://www.videosift.com/video/Liquid-Helium-II-the-Superfluid-a-Physics-Demonstration I thought this http://www.videosift.com/video/Bose-Einstein-Condensate-The-Coldest-Matter-in-the-Universe would interest you.

Since you posted http://www.videosift.com/video/Liquid-Helium-II-the-Superfluid-a-Physics-Demonstration I thought this http://www.videosift.com/video/Bose-Einstein-Condensate-The-Coldest-Matter-in-the-Universe would interest you.

I found the full version
http://www.videosift.com/video/Liquid-Helium-II-the-Superfluid-a-Physics-Demonstration

Found the full version
http://www.videosift.com/video/Liquid-Helium-II-the-Superfluid-a-Physics-Demonstration

In reply to this comment by Fade:
um...any chance of finding the full version?

Alright, I guess I did get too channel happy.

I think think the science channel is appropriate if the simulated data is good but the author doesn't give any info on authority or accuracy.

For a more sciencey look at superfluid see this sift.

This appears to be just some artsy particle animation with some fluid-y dynamics trown in, not a proper superfluid simulation. It's just called "Superfluid".

Art, yes, but not science and engineering.

Thanks for your comment, it's always good to have more input.

In reply to this comment by IMSabbel:
I registered just to correct this description:

There is a difference between superfluidity and a bose einstein condensate. The effect of superfluid Helium might be descriped by the BEC theory, but its far from a "real" one in the theoretical sense. (otherwise, the creation of those wouldnt have been worth a nobel price not too long ago)

The exact explanation is a bit to long for that comment-field, but lets say that the demands for a BEC are _much_ higher than for superfluidity.

To get all atoms to occupy the lowest quantum state, such crude ways like the shown double dewar wont do it.
In fact, normally you would use a penning-trap, and do laser and evaporation cooling to get a few 100k atoms at the end with temperatures in the microkelvin range.


But superfluidity in itself is cool enough: You can also use it as near perfect cooling liquid (and you DO, for example in the LHC): Superfluid helium has _no_ thermal resitance. Heat can spread in it with the speed of sound, allowing the transportation of heat for km with only a minimal temperature rise.
Otherwise, supplying all those magnets in the LHC-Tunnels would be next to impossible.

I registered just to correct this description:

There is a difference between superfluidity and a bose einstein condensate. The effect of superfluid Helium might be descriped by the BEC theory, but its far from a "real" one in the theoretical sense. (otherwise, the creation of those wouldnt have been worth a nobel price not too long ago)

The exact explanation is a bit to long for that comment-field, but lets say that the demands for a BEC are _much_ higher than for superfluidity.

To get all atoms to occupy the lowest quantum state, such crude ways like the shown double dewar wont do it.
In fact, normally you would use a penning-trap, and do laser and evaporation cooling to get a few 100k atoms at the end with temperatures in the microkelvin range.


But superfluidity in itself is cool enough: You can also use it as near perfect cooling liquid (and you DO, for example in the LHC): Superfluid helium has _no_ thermal resitance. Heat can spread in it with the speed of sound, allowing the transportation of heat for km with only a minimal temperature rise.
Otherwise, supplying all those magnets in the LHC-Tunnels would be next to impossible.

There is a video, in English, with some of the same scenes here: http://www.videosift.com/video/Superfluid-helium

Awesome! I have searched for vids of superfluids in the past without luck! Great job on the description too!

A truely fascinating field of study, not only in terms of the peculiar properties of BEC's, most of which this video doen't get into, but the ingenious methods used to remove energy from these groups of atoms. I initially began researching this topic by way of the investigating questions that had been a thorn in my mind for far too long:

How the fuck does a laser cool something? Don't lasers heat, melt, burn, evaporate, etc?
The answers to this questions led me to BEC's, Superfluidity, Supersolids, Feshbach resonance, ...

It was a satisfying foray into physics.