Liquid Helium II: The Superfluid - segment 3of5

Physics demonstration by Alfred Leitner, 1963

Category:

Education

Tags:

• physics
• liquid
• helium
• superfluid
• alfred
• leitner

[nmrmak]

i admire your patience.

[prismaticaurora]

science!

[pinalo2009]

i cant work, my glasses? where was it

[phaselapsecore]

amazing research. he stated himself that it's uncertain weather the 2 fluid model is correct or not. the answer has been uncovered in more recent years being magnetic drag.

[conciousness88]

i want to drink it

[thepcguy01]

is liquid helium 2 a bose-einstein condensate?

[xespguitarsx]

Ok lanpfisher ---- Your point is somewhat correct. Even though vacuums are added to keep molecules from reaching a container, no vacuum is perfect. So.... molecules (other than the substance trying to be cooled to absolute zero) are still floating around.

[Ianpfisher]

@xespguitarsx

You aren't taking into account vacuums around the container. However you're still right, in the event you try to thermally insulate through a vacuum the minor radiation heat increases will result in vibrations of the atoms.

[Ianpfisher]

Okay, this isn't correct. I realise it's old but it doesn't flow through the glass/ceramic, it flows over the outside surface of the container, which I think is possibly even more incredible.

[xespguitarsx]

Ok....let me state why absolute zero just isn't possible. It might be a theory, but it's one thing mankind will never achieve. Just because we have gotten close, doesn't mean that it's going to happen. There will ALWAYS be a small amount of vibration in an atom. The reason why it will not reach absolute zero is the atom is surrounded by air that is constantly warmer than the atom itself. So THEORETICALLY.... we aren't close at all.

[thedoubler67]

@Humidi No, it has heat. If it had no heat, it would need to be at absolute zero [0 Kelvin], which is theoretically possible, but has not been obtained in a controlled setting.

[paragshah2112]

@Humidi e=m(c*c) applies on einsteinian scales, and means nothing on newtonian scales, and doesnt practically apply at quantum scales. that is the issue we have here. the disparity breakdown between newtonian scales and quantuum scales is kinda sorta forshadowing itself here.

and to think there are two more of these clips in the movie!! i got a boner ...