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Thread: Does a super-cooled magnet levitated in a vacuum maintain its temperature?

  1. #1 Does a super-cooled magnet levitated in a vacuum maintain its temperature? 
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    Based on speculation, I would imagine that it would. How would heat transfer between the outside world and the magnet if there is a void of particles between them?


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    Quote Originally Posted by railnet View Post
    Based on speculation, I would imagine that it would. How would heat transfer between the outside world and the magnet if there is a void of particles between them?
    By radiative heat transfer for one.


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    Quote Originally Posted by railnet View Post
    Based on speculation, I would imagine that it would. How would heat transfer between the outside world and the magnet if there is a void of particles between them?
    As the Moderator said, radiative heat transfer would be quite effective. Imagine what happens if you take a very bright lamp and shine it on an object. With or without a vacuum, that object will heat up. A vacuum prevents convection and conduction from working, but radiation still works. Satellites count on radiative heat transfer, by the way, without which they'd melt down.
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  5. #4  
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    Good point. Is it possible to have a radiant barrier that 100% reflects radiation?

    Whether or not it is possible, for theoretical purposes, assume the entire system in insulated by a radiant barrier to prevent radiative heat transfer. Would the magnet then maintain its temperature?
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    Quote Originally Posted by railnet View Post
    Good point. Is it possible to have a radiant barrier that 100% reflects radiation?

    Whether or not it is possible, for theoretical purposes, assume the entire system in insulated by a radiant barrier to prevent radiative heat transfer. Would the magnet then maintain its temperature?
    It is not possible. Then I think that the magnet will give rise to a new phenomenon unknown to us in this universe, to get rid of the excess heat energy possessed by it. And obviously it will lose its magnetism as magnetism is inversely proportional to absolute temperature.
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  7. #6  
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    No. Even if no heat is radiated, the material surrounding the vacuŁm will still slowly decay. The decaying particles will impart energy to the magnet, slowly heating it up. even if you asume a perfectly stable material, the magnet will still heat up, because the perfect vacuŁm is not perfect. No space is perfectly empty. Virtual particles will pop into existance and will imediately annihilate each other, imparting a tiny amount of energy to the magnet. It might take forever but the magnet will heat up eventually.
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