CupOfWater
New Member
What can we use superfluids for?
I suppose it's got some kind of use since it have no friction...
I suppose it's got some kind of use since it have no friction...
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GoodKat said:Never hard of this, could it be used as a lubricant? I'm always looking for something new to grease the slide of my Beretta with.
Curses! I'll have to stick to the usual Teflon particle suspension.CupOfWater said:Haha, sorry to dissapoint you, but no, you can't use it as a lubricant for your baretta.
It's almost 0 K.
As much as I love my guns, our gun laws are bullcrap. Everyone here is on one of two sides, either "everyone should have whatever guns they want" or "no one should have any guns". You would have a hard time finding a single gun law here that is actually meant to keep guns away from criminals.CupOfWater said:You americans with your crazy gun laws
GoodKat said:As much as I love my guns, our gun laws are bullcrap. Everyone here is on one of two sides, either "everyone should have whatever guns they want" or "no one should have any guns". You would have a hard time finding a single gun law here that is actually meant to keep guns away from criminals.
CupOfWater said:I just remembered, they use superfluid helium to cool down the superconducting elements in the magnets over at CERN.
Ah yeah, you are probably talking about the one that shows them leaking through the ceramic bottomed glassware that has very small pores. A superfluid cannot get through regular glassware.Spase said:If I remember right it seeped right through regular borosilicate glassware. I could be mistaken or it could be bad information but that's what I remember. It came from some old school documentary clip on youtube.
Josan said:Yes they do, but does it have to be superfluid? Obviously they are using it to cool down the magnets so that they are super-conducting, but is there any reason for using a superfluid liquid?
Applications
Recently in the field of chemistry, superfluid helium-4 has been successfully used in spectroscopic techniques as a quantum solvent. Referred to as Superfluid Helium Droplet Spectroscopy (SHeDS), it is of great interest in studies of gas molecules, as a single molecule solvated in a superfluid medium allows a molecule to have effective rotational freedom, allowing it to behave exactly as it would in the "gas" phase.
Superfluids are also used in high-precision devices such as gyroscopes, which allow the measurement of some theoretically predicted gravitational effects (for an example see the Gravity Probe B article).
Recently, one type of superfluid has been used to trap light and slow its speed greatly. In an experiment performed by Lene Hau, light was passed through a Bose-Einstein condensed gas of sodium (analogous to a superfluid) and found to be slowed to 17 metres per second from its normal speed of 299,792,458 metres per second in vacuum.[3] This does not change the absolute value of c, nor is it completely new: any medium other than vacuum, such as water or glass, also slows down the propagation of light to c/n where n is the material's refractive index. The very slow speed of light and high refractive index observed in this particular experiment, moreover, is not a general property of all superfluids.
The Infrared Astronomical Satellite IRAS, launched in January 1983 to gather infrared data was cooled by 720 litres of superfluid helium, maintaining a temperature of 1.6 K (-271.4 ,,°C).