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  2. 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).

  3. Helium cryogenics - Wikipedia

    en.wikipedia.org/wiki/Helium_cryogenics

    The combination of helium’s extremely low molecular weight and weak interatomic reactions yield interesting properties when helium is cooled below its critical temperature of 5.2 K to form a liquid. Even at absolute zero (0K), helium does not condense to form a solid under ambient pressure. In this state, the zero point vibrational energies ...

  4. Electron bubble - Wikipedia

    en.wikipedia.org/wiki/Electron_bubble

    When an electron is forced into liquid helium rather than floating on its surface, it forms a bubble rather than entering the liquid. The size of this bubble is determined by three main factors (ignoring small corrections): the confinement term, the surface tension term, and the pressure-volume term.

  5. Helium - Wikipedia

    en.wikipedia.org/wiki/Helium

    There are two liquid phases: Helium I is a conventional liquid, and Helium II, which occurs at a lower temperature, is a superfluid. Helium I Below its boiling point of 4.22 K (−268.93 °C; −452.07 °F) and above the lambda point of 2.1768 K (−270.9732 °C; −455.7518 °F), the isotope helium-4 exists in a normal colorless liquid state ...

  6. Inhalational anesthetic - Wikipedia

    en.wikipedia.org/wiki/Inhalational_anesthetic

    Helium at high pressures produces nervous irritation ("anti-anaesthesia"), suggesting that the anaesthetic mechanism(s) may be operated in reverse by this gas (i.e., nerve membrane compression). Also, some halogenated ethers (such as flurothyl ) also possess this "anti-anaesthetic" effect, providing further evidence for this theory.

  7. The world is running out of helium. Here's why doctors are ...

    www.aol.com/news/world-running-helium-heres-why...

    That’s where helium comes in: With a boiling point of minus 452 degrees Fahrenheit, liquid helium is the coldest element on Earth. Pumped inside an MRI magnet, helium lets the current travel ...

  8. Cryogenic seal - Wikipedia

    en.wikipedia.org/wiki/Cryogenic_seal

    Soft and pliable at room temperature, due to the low melting temperature of indium, so it fills imperfections. This creates an impervious bond between the mating surfaces, crafting a hermetic seal which remains malleable at cryogenic temperatures [8] Seal integrity remains following thermal shock from room temperature to immersion in cryogenic ...

  9. Heliox - Wikipedia

    en.wikipedia.org/wiki/Heliox

    Heliox is a breathing gas mixture of helium (He) and oxygen (O 2).It is used as a medical treatment for patients with difficulty breathing because this mixture generates less resistance than atmospheric air when passing through the airways of the lungs, and thus requires less effort by a patient to breathe in and out of the lungs.