superfluid Helium II

No description available.

Category:

Science & Technology

Tags:

• superfluid
• Helium
• II

[achmedfu]

when its says T<2.2K does that mean it is below absolute zero? caz i didnt know you could get any colder lol

[JNHeyman]

@achmedfu

No - The the temperature was just between 2.2K and zero, but greater than zero, of course.

[Theasbestross]

Ok I have a very valid question. At this temperature Helium takes on the superfluid state with atoms acting in singular waves and zero viscosity. What addition can be made to Helium with magnetic or conducting properties, that will remain at these temperatures without affecting the zero viscosity properties?

[JNHeyman]

@Theasbestross

Good questions: First, although I work with liquid helium, I am not an expert. There has been a LOT of scientific work done on this, but not by me.

Helium atoms are essentially non-magnetic (no net electron or nuclear spin), so a magnetic field should have no effect. It's also insulating - no free electrons.  Interestingly, if free electrons are injected into it, it forms bubbles around the electrons. electrons can also be trapped at surface to form nearly ideal 2D metal.

[pianomikey0]

Wouldn't it have flowed out of the container? Or was their a transparent lid over it?

[JNHeyman]

The container (the inside of the cryostat) is very long and deep, and the liquid helium is at the bottom. The top of the container is near room temperature, so liquid helium boils before it can "creep" up the sides. In fact, all the liquid helium in the container boils away in about 15 minutes unless it is refilled.

[yarahahrwe]

I can fairly confidently say no

[deiutz]

@achmedfu 0k would be absolute zero

[AntiProtonBoy]

Interesting subject, too bad the video quality is very poor. Any chance of a re-upload?

[MysticGohan127]

i don't see shit captn

[ilivemw2]

@achmedfu nothing can get colder that absolute zero hints the name

[AIRJUSTY]

Nice!

[MrPepsi305]

Ummm, can someone tell me how I got from Minecraft to this?

[denvera1g1]

@11Sparky111 ***no kinetic energy left, witch is possible, my question is if that includes the movements of electrons and other sub atomic structures

[denvera1g1]

sense helium4 II is not viscus could a perpetual fountain be made? where you release the initial volume of SF so that it falls into a funnel through a tube that "Us" and sends it up again in a ballistic freefall, to theoretically the same hight as where you dropped it, into another identical funnel/tube to repeat the process through a series of tubes that eventually lead back to tube 0?