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Not the same thing

Submersing electronics in liquid nitrogen to lower the noise floor is different than having cables submerged and then brought back up to room temperature. By submerging electronics you lower the noise by reducing random electrical signal due to thermal effects (at the atomic scale there is never zero motion of electrons and sometimes they randomly fire off giving a background signal. This is dependent on temperature and so the lower the temperature the less of these random fluctuations will occur. This is especially useful for low light detection with a CCD camera and reduces the background to near zero). It appears though that by shrinking the metal to its extreme limit (thereby removing most of what little space there was left) gives a somewhat better electrical behavior in the metal. I wonder though if this is in some way measurable or not?
I would think that this would only work with wire that has multiple grain boundaries. A cable made from a single crystal copper or silver would not have these boundaries and therefore would not benefit from the cryogenic effect.


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  • Not the same thing - morricab 10/20/0304:47:56 10/20/03 (0)


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