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  2. Helium - Wikipedia

    en.wikipedia.org/wiki/Helium

    Similar cooling of helium-3, which has a lower boiling point, can achieve about 0.2 kelvin in a helium-3 refrigerator. Equal mixtures of liquid 3 He and 4 He below 0.8 K separate into two immiscible phases due to their dissimilarity (they follow different quantum statistics: helium-4 atoms are bosons while helium-3 atoms are fermions). [30]

  3. Boiling points of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Boiling_points_of_the...

    This is a list of the various reported boiling points for the elements, with recommended values to be used elsewhere on Wikipedia. ... 2 He helium; use: 4.222 K: − ...

  4. Liquid helium - Wikipedia

    en.wikipedia.org/wiki/Liquid_helium

    Liquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures.Liquid helium may show superfluidity.. At standard pressure, the chemical element helium exists in a liquid form only at the extremely low temperature of −269 °C (−452.20 °F; 4.15 K).

  5. Explainer-What is helium and why is it used in rockets? - AOL

    www.aol.com/news/explainer-helium-why-used...

    Helium also has a very low boiling point (-268.9°C or -452°F), allowing it to remain a gas even in super-cold environments, an important feature because many rocket fuels are stored in that ...

  6. Boiling point - Wikipedia

    en.wikipedia.org/wiki/Boiling_point

    The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure ... The element with the lowest boiling point is helium.

  7. Helium atom - Wikipedia

    en.wikipedia.org/wiki/Helium_atom

    Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with two neutrons, depending on the isotope, held together by the strong force. Unlike for hydrogen , a closed-form solution to the Schrödinger equation for the helium atom has not been found.

  8. Helium-3 - Wikipedia

    en.wikipedia.org/wiki/Helium-3

    Pure helium-3 gas boils at 3.19 K compared with helium-4 at 4.23 K, and its critical point is also lower at 3.35 K, compared with helium-4 at 5.2 K. Helium-3 has less than half the density of helium-4 when it is at its boiling point: 59 g/L compared to 125 g/L of helium-4 at a pressure of one atmosphere.

  9. Heats of vaporization of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Heats_of_vaporization_of...

    2 He helium; use: 0.0829 CRC: 0.08 LNG: 0.0829 WEL: 0.083 3 Li ... Values refer to the enthalpy change in the conversion of liquid to gas at the boiling point (normal ...