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How to cool down to mK?

  1. Nov 7, 2015 #1

    fresh_42

    Staff: Mentor

    I've just read about the second sound and that this phenomenon can be seen in superfluid 3He at 2.5 mK. How do they manage to come that close to 0?
    A short hint about the methods would be nice to read. Normally you hear that things are cooled by fluid nitrogen or helium. But mK are out of reach by those.
     
  2. jcsd
  3. Nov 7, 2015 #2

    Vanadium 50

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  4. Nov 7, 2015 #3

    fresh_42

    Staff: Mentor

    Last edited: Nov 7, 2015
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