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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
Neilep Level Member
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
at very high pressures inside Jupiter might be a superconductor at temperatures as high as "room temperature" (25C).
may also be superconducting despite extremely high temperatures