enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Helium - Wikipedia

    en.wikipedia.org/wiki/Helium

    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, called helium I. [30] Like other cryogenic liquids, helium I boils when it is heated and contracts when its temperature is lowered. Below the ...

  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 element with the lowest boiling point is helium. Both the boiling points of rhenium and tungsten exceed 5000 K at standard pressure; because it is difficult to measure extreme temperatures precisely without bias, both have been cited in the literature as having the higher boiling point. [11]

  7. Helium compounds - Wikipedia

    en.wikipedia.org/wiki/Helium_compounds

    Helium is a very hard atom with a Pearson hardness of 12.3 eV. [3] It has the lowest polarizability of any kind of atom, however, very weak van der Waals forces exist between helium and other atoms. This force may exceed repulsive forces, so at extremely low temperatures helium may form van der Waals molecules. Helium has the lowest boiling ...

  8. List of gases - Wikipedia

    en.wikipedia.org/wiki/List_of_gases

    Helium-3: 3 He −269.96 N/A 3 14762-55-1 Helium-4: 4 He −268.928 N/A 4 ... The following list has substances known to be gases, but with an unknown boiling point.

  9. Properties of nonmetals (and metalloids) by group - Wikipedia

    en.wikipedia.org/wiki/Properties_of_nonmetals...

    It has the lowest boiling point of all of the elements. Liquid helium exhibits super-fluidity, superconductivity, and near-zero viscosity; its thermal conductivity is greater than that of any other known substance (more than 1,000 times that of copper). Helium can only be solidified at −272.20 °C under a pressure of 2.5 MPa.