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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.
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.