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Offline jaiii

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« on: 19/01/2014 10:38:50 »

Whot happend with super conductor when could his les than his criticall themperature?
(temperature of vacuum)


« Last Edit: 20/01/2014 09:59:38 by evan_au »


Offline evan_au

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Re: supercunduction
« Reply #1 on: 20/01/2014 09:59:08 »
When the temperature of a superconductor falls below the Critical Temperature Tc, the resistance suddenly drops to zero. However, superconductivity can be suppressed by the presence of an external magnetic field.

Note that the temperature of an object in a vacuum has no relationship with Tc.
- In the vicinity of the Earth & Moon, the temperature of an object in a vacuum will be about -15C (depending on what container it is in). This is due to the proximity of our Sun, and is far above the Tc for any material we have manufactured*.
- In between galaxies, the temperature of an object in a vacuum will drop down to about the level of the Cosmic Background Radiation, or 2.7K. This is cold enough to turn mercury into a superconductor, but there are other substances with much lower Tc than 2.7K 

* It is thought that metallic hydrogen at very high pressures inside Jupiter might be a superconductor at temperatures as high as "room temperature" (25C).
Neutron Stars may also be superconducting despite extremely high temperatures