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Liquid helium

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Superfluid helium

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Why Helium cant Freeze

3:21

A Liquid That Pours Itself! The Self-Siphoning Fluid: Polyethylene Glycol

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Superfluid helium defies gravity.

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Make solid oxygen with this trick: Freezing in liquid helium

At standard pressure, the chemical element helium exists in a liquid form only at the extremely low temperature of −270 °C. Its boiling point and critical point depend on which isotope of helium is present: the common isotope helium-4 or the rare isotope helium-3. These are the only two stable isotopes of helium. See the table below for the values of these physical quantities. The density of liquid helium-4 at its boiling point and a pressure of one atmosphere is about 0.125 grams per cm3, or about 1/8th the density of liquid water.
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    • Liquefaction 

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