Quote:
Originally Posted by ila
All the references that I checked said helium would freeze at 1 - 1.5*K, but they also agree with your statement that helium has to be compressed before it will freeze. Of course compressing gases is one way to bring down the temperature.
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Without raising the pressure helium would stay liquid at absolute zero. You can not bring it down any further than absolute zero, but raising the pressure will still do the trick.