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#485343 - 01/19/13 12:57 AM Co-ordinates?
Dax9 Offline

CoS Member

Registered: 10/16/10
Posts: 699
Loc: near Baton Rouge, LA
This is not of major importance and I apologize if this has already been explained, but what are those numbers that look like co-ordinates that are now beneath everyone's avatar?

Just wondering. smile
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#485362 - 01/19/13 12:41 PM Re: Co-ordinates? [Re: Dax9]
Quaark Offline

CoS Reverend

Registered: 08/22/03
Posts: 8697
Thank you for bringing this to our attention, it is appreciated and will be addressed.
Helium II is a superfluid, a quantum mechanical state of matter with strange properties .

The thermal conductivity of helium II is greater than that of any other known substance, a million times that of helium I and hundred of times that of copper. This is because heat conduction occurs via a quantum mechanism.

Second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the usual mechanism of diffusion. Heat takes the place of pressure in normal sound waves. This leads to very high thermal conductivity. It's known as "second sound" because the wave motion of heat is similar to the propagation of sound in air.

Sound waves are fluctuations in the density of molecules in a substance; second sound waves are fluctuations in the density of phonons. Second sound can be observed in any system in which most phonon-phonon collisions conserve momentum. This occurs in superfluids and in dielectric crystals when Umklapp scattering is small.


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