Liquid Helium II the superfluid (part 4 The fountain effect)

[Rynnakokki]

Put on audiotranscript and play at 2:18

[Zantorc]

@Rynnakokki LOL . Very funny.

[Rynnakokki]

@Zantorc Sometimes you have to be immature, even when it comes to super fluid demonstrations.

[MOAKmemoirs]

@Rynnakokki brilliant hahah

[I0o]

@Rynnakokki aaahhaaha

[krat0s3]

Cave Johnson

[Zantorc]

@krat0s3

The 12th United States Postmaster General, who held office March 6, 1845 – March 4, 1849?

[teeoff123456]

@Zantorc The founder of Aperture Science. Died due to Moon Rock poisoning? Never heard of him? weird...

[mile0chicken]

@Zantorc *facepalm*

[Zantorc]

@02watsot

B is wrong. Temperature is related to kinetic energy distribution. The E in E=MC^2 is not kinetic energy. A 2 Kg mass is not twice as hot as a 1Kg mass

[Dignitas93]

There's one thing I wonder about:

If the superfluid converts any thermal energy added into mechanic energy, how can it again be heated and turned into gas? Will it always stay superfluid? If so, why isn't it used in nuclear fission power plants to produce energy since it perfectly converts the heat into movement?

[Zantorc]

@Dignitas93 "If the superfluid converts any thermal energy added into mechanic energy, how can it again be heated and turned into gas?"

In general it doesn't and in this experiment only part of the heat is converted into mechanical energy.

[auntiepicklebottom]

If you drink it does your pee make a really high pitched sound when it hits the toilet water?

[ucsirap]

It is possible that the helium been heated is less dense than the one that remains cool. After all the normal estate of helium is in gas form, so this liquid may maintain some gas properties when heated.

[Zantorc]

@ucsirap Yes it's slightly warmer, but there is negligable difference in density (as you can see because the volume doesn't change by any visible amount). The ultimate cause of the fountain effect is quantum mechanical so it can't be explained in everyday terms.

[ucsirap]

@Zantorc "cause of the fountain effect is quantum mechanical "

yet QM in 80 years have not incorporate gravity within the theory, use the planetary model of the atom and claims that the electron is a 0 size particle.

[Zantorc]

@ucsirap It is not a case of incorporating gravity in QM, any more than QM in gravity. They are mutually incompatible and so require a theory containing both as limiting cases.

The planetary model of the atom was abandoned in the 1920s.

Experimentally no one has detected any size for the electron.

More importantly there is no mystery in the fountain effect it is entirely explained by QM, so your criticism (if that is what it is) seems a little odd.

[ucsirap]

@Zantorc "The planetary model of the atom was abandoned in the 1920s"

then what model of the atom use QM this days?

@Zantorc "More importantly there is no mystery in the fountain effect it is entirely explained by QM"

QM EXPLAIN!!. Please explain the fountain effect if the helium liquid and don't give me just a description, so you must answer 'WHY the helium go up and not remain still?' and don't please don't answer like it was a HOW question, other wise it will be a description.

[Zantorc]

@ucsirap The image of an electron going round an atom in an orbit could not be more wrong. The p, d and f states are not even spherically symmetric. It is quite impossible to reconcile the probability density for these, as resulting from a classical orbit.You are describing the Bohr model (abandoned in the 1920s) its sucessor, the wave model, is too mathematical for the general public to understand.

See my comment of 3 months ago for an explanation of the fountain effect.

[ucsirap]

@Zantorc "the wave model"

what is waving in the wave model? if you say 'is the electron' then it is not different from the planetary model, unless the electron is not a particle, but QM only deals with particles, after all QM is a particle theory.

@Zantorc "See my comment of 3 months ago for an explanation"

thats a description, you don't explain WHY more sf has to flow in? does the normal (heated sf) is less dense and allow more sf (non heated sf) flow in. If not then WHY?

[Zantorc]

@ucsirap Electron position is given by a complex valued function which is the solution of a partial differential equation of a particular form known as a wave equation. This wave function phi is the complete description of the electron, |phi| gives the probability density. P orbit probability densities form 2 lobes on opposite sides of the atom with zero probability for the equatorial plane - that cant be viewed as a classical orbit.- every classical orbit has to cross the equatorial plane.

[Zantorc]

@ucsirap If you put say a 1 cm diameter tube open at both ends vertically into water you would expect the level inside to match that outside.The level of superfluid inside has dropped (because it's been partly converted to the normal component) so sf flows in. Why is that difficult to understand? Nothing to do with density.

[Zantorc]

@ucsirap The human brain evolved in a classical macroscopic world, QM is therefore intrinsically non-intuitive. However using mathematical insight you can get an intuitive feel - but that is beyond the ability of the average member of the general public. Ordinary laws of logic don't hold in QM, seen most obviously in Bell's inequality. Wave and particle are classical concepts, wave particle duality means there's no distinction between them in QM.

[brian12934]

its the lube of the future

[SAMKUANKENT]

0.52 u will see the light beam when the lamp is turned on...lame...



[beric89]

Thank you. You helped me a lot! Great video

[KingofAces2895]

this guy sounds just like ren from ren and stimpy lol. Great experiment although i will never understand that if something has no viscocity why doesnt it just keep moving forever.

[pixartist]

does that mean that superfluids can transform heat into movement without loss of energy ?

[Zantorc]

@pixartist In terms of the 2 component model: Temperature (T) determines the ratio of normal to super. At 0 K it's all super at the lambda point its all normal. It's a dynamic equilibrium, atoms are not fixed in one state or the other. The superfluid (sf) sees no barrier so it reaches its natural level and T dictates that some of it will become normal. The lamp increases T so the amount of sf has to drop. From the sf's point of view, more fluid has to flow in. That flow is without energy loss.

[pilltaker2]

buttsex! naw this is awsome i like seeing gasses into liquid form

[GilHeron]

Why don't we have tv shows of this?! We have jersey shore and Time warp... Why not this?!?!?!?!

[mykingshuk]

Why the superfluid phase has finite specific heat if it has zero entropy?

[berndpfe]

Since Helium in State II has any entrophy, means no viscosity and no self-contained energy to be transportable, it is very likely that the atomic structure of Helium in this state is merely non-oscillating (no brown thermal movement). This enables the molecules to "flow" without any resistance across every surface havnig same temperature, and through every hole which at least allows 1 molecule diameter to pass through. The adhesion between the moulecules is infinitely low.

[luisdanielmesa]

what's the name of the powder?

[Zantorc]

A exceptionally fine powder of ferric oxide, known as 'jeweller's rouge'. It is used to polish jewellery and remove scratches from glass.

[luisdanielmesa]

thank you =)