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Solid Helium is difficult to produce; at normal atmospheric pressure it will not solidify, even at 00 Kelvin. ( aka Absolute zero, or -2730C )

Exactly how cold Helium must be to solidify depends on the pressure it is under. The standard way to show the numbers is on a phase diagram. These can be found on Google. Since we can't put diagrams on Wiki Answers, you will only get one of the possible answers here.

If you cool Helium to 20 K, it will solidify at about 2.5 MPa. This is about 25 atmospheres or a little under 400 p.s.i. 2.5 MPa is close to the lowest pressure at which Helium will solidify.

Note. Helium has more than one isotype; the numbers above are for the common isotope Helium 4.

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