Liquid Helium II: The Superfluid - segment 1of5

[basicproblem]

this is some shit that I dont really understand ! im eager 2 tho

[paragshah2112]

this is so cool. i have been watching this and the "absolute zero" nova episode on youtube. THANK YOU DR LIETNER, i wish my chem profs were as clear and inspiring as you. oh yeah and GO STATE!!!

[Carinae13]

Dr Leitner, I hope you read this as I want you to know that I was fascinated by your experiments. Your lecture is no less wonderful and inspiring today than it was 47 years ago. I wish scientists today could explain what they are doing with such clarity.

PS A Happy New Year from Glasgow in Scotland

[RebelForce8]

id like some solid helium, can it be done

[JoshuaStone7]

Only at high pressure...

[gavincurtis]

That is phase I and II in liquid form?

[gavincurtis]

Does liquid mercury have a similar transition property?

[eVentyrBoost]

No mercury wi freez solid if I remember correct

[BirdValiant]

It's strange to see "degrees Kelvin," the use of calories, and the abbreviation "gm." Still, the standards haven't changed too much.

[patrick61503]

liquid air? shouldnt he say oxygen

or nitrogen depending on what he means

[gtq838]

of course but this was recorded for tv meaning recorded for idiots. At least when they recorded it people in general were pretty ignorant when it comes to chemistry, your local HS didn't have a chemistry dep.

[metabog]

People are still pretty ignorant about chemistry. :p

[gtq838]

agreed.

[UnowMe00]

as chemistry is vice versa!

[archerofyail]

dude air has oxygen and nitrogen and a bunch of other gases

[patrick61503]

i know that its just that dont they usually single out a element so that it wont sperate wen expanded

[Haukenslush]

how in the Hell did you get this video?

[zigfr33]

lol yer its just kelvin

[mikemc17]

You never say "degrees Kelvin", its just "Kelvin"!

[CollectsWelfare]

I'm sure he knows this, but at the same time he realizes that the average layman (me) watching the film does not know that. He's probably saying "degrees Kelvin" to clarify for us dummies.

[Sforschondetta]

sometimes im proud to be a human. we can kik ass some times

[GamerAlex1337]

Oh ok thanks :)

I don't like using wiipedia though, seeing as anyone can edit it.

[roguehearts]

Wikipedia is not as anonymous as it may seem. For the most part it is written by few contributors and editors police their pages & projects. There are more reverts than edits that stay. It's a safe place, and is more up to date than many encyclopedias. However, always use caution when researching online. You can always verify sources yourself.

[desiredusername]

I don't like using other encyclopedias, seeing as I can't edit it.

[GamerAlex1337]

If you put a superfluid into a centrifuge and rotated it faster and faster would it never stop and keep accelerating because there's no friction? Would this possibly break the speed of light eventually, if it never stops accelerating, maybe it would!

[Junuxx]

No, that's not how relativity works, sorry!

Try the wikipedia page on relativity theory for a better explanation.

[roguehearts]

I watched the whole series and I am in complete awe at the results of the experiments. I'm wondering, can the dualistic, bizarre properties of liquid helium-II help explain those same qualities of quantum mechanics that have been stumping physicists?

[Junuxx]

no it's the other way around, QM can explain how this fluid behaves :p

[roguehearts]

Obviously, but I was looking at it from another angle.

[nolaeast]

This is great stuff. Thanks for posting

[ale86itn]

This film is a "demonstration lecture". The phenomena shown were discovered by others years before the film was made. The narration was written by me. -- My own research was in compledtely differnt fields of physics.

[Danitech2999]

This material is almost perfect: it shows all the esential features and complexities of experimental physics, like the equipment that are required to use and the uncertainties that arise. All the significant findings related to superfluidity are presented in a straight, crystal clear a logic way. I even enjoy the neutral and precise style Dr. Leitner is using through the whole film - see how almost no adverbs are used - and the quiet pace. How badly we need such a science divulgation material.

[ale86itn]

Many thanks for your comment.

[boxa888]

what a great scientist! he holds nothing back! great guy!

[rrelaxx99]

helium has been frozen into a solid state at 20 atmospheres- Helium isotopes 2 and 3 have there own characteristics. research this and you will find helium is one of the most unusual, yet amazing elements we have been able to uncover.

[SERga134]

where are images of solid helium?

[ocean514]

Serious question?

[rhddrifter86]

quantum mechanics FTW!

[chamillionator8]

This is what they supposedly used in the movie "The Entity"

[ale86itn]

Yes, of course:you're right, and I'm sorry! At higher pressures He-4 remains a solid no matter how far you cool it.I refer you to the Encyclopedia of Physics, where the phase diagram for He-4 is discussed in some detail under the entrries "Liquid Helium" and "Solid Helium". As a matter of fact a "SUPERSOLID HELIUM" state has been identified in 2004, and is mentioned in the Third Edition of this encyclopedia.

[tronfxr]

Any way to get a copy of this series? I give cryo classes where I work and this would help. The buffering make these videos impossible to present during a presentation. This is good info- thanks!

[ale86itn]

Yes. Go to: alfredleitner>com

[tronfxr]

Thanks much for the reply but the DVD download link does not work. Would you know how to contact the persons maintaining the site?

[ale86itn]

Someone will try to get in touch with you. Pleasae excuse any delay; there REALLY was a death in the fdamily.

[tronfxr]

Am so sorry to hear of your loss. Please accept my deepest condolence.

[shaman2high]

intresting stuff, i hear the viscousity of liquid helium at close to freezing is near zero, anyone know where i can witness this

[bmatulis]

Helium cannot be frozen (though it has been solidified under pressure). Viscosity experiments can be viewed in the other segments of this film.

[misteratoz]

Don't you think it can be frozen at absolute zero?

[ale86itn]

It has not been frozen no matter how close to absolute zero it has been cooled, even at millionths of degrees. By the wa, absolute zero cannot be reached by any finite series of cooling processes !

[misteratoz]

I know that absolute 0 cannot be reached but liquid helium I believe can become solid under great pressure as well as low temperature.

[Gustreznor]

Tks for this man :)