With help from liquid helium, the temperature in most parts of the LHC at CERN is down to 1.9 Kelvin (i.e -271 degrees C) just below the temperature in outer space (about 2.7 Kelvin). Such low temperatures would enable superconductivity and at these temperatures helium behaves like a super-fluid. The cooling down to such temperatures takes 3-6 weeks.
Courtesy: Ryanhaart@youtube
Read the story on the BBC online and the bigbangtheory whiteboard.
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