When.com Web Search

Search results

  1. Results From The WOW.Com Content Network
  2. Liquid hydrogen - Wikipedia

    en.wikipedia.org/wiki/Liquid_hydrogen

    However, the liquid density is very low compared to other common fuels. Once liquefied, it can be maintained as a liquid for some time in thermally insulated containers. [6] There are two spin isomers of hydrogen; whereas room temperature hydrogen is mostly orthohydrogen, liquid hydrogen consists of 99.79% parahydrogen and 0.21% orthohydrogen. [5]

  3. Spin isomers of hydrogen - Wikipedia

    en.wikipedia.org/wiki/Spin_isomers_of_hydrogen

    Since "normal" room-temperature hydrogen is a 3:1 ortho:para mixture, its molar residual rotational energy at low temperature is (3/4) × 2Rθ rot ≈ 1091 J/mol, [citation needed] which is somewhat larger than the enthalpy of vaporization of normal hydrogen, 904 J/mol at the boiling point, T b ≈ 20.369 K. [10] Notably, the boiling points of ...

  4. Thermochemical cycle - Wikipedia

    en.wikipedia.org/wiki/Thermochemical_cycle

    A low temperature (T°), thermal agitation allow mostly the water molecules to be excited as hydrogen and oxygen levels required higher thermal agitation to be significantly populated (on the arbitrary diagram, 3 levels can be populated for water vs 1 for the oxygen/hydrogen subsystem), At high temperature (T), thermal agitation is sufficient ...

  5. Water splitting - Wikipedia

    en.wikipedia.org/wiki/Water_splitting

    Usually, the electricity consumed is more valuable than the hydrogen produced, so this method has not been widely used. In contrast with low-temperature electrolysis, high-temperature electrolysis (HTE) of water converts more of the initial heat energy into chemical energy (hydrogen), potentially doubling efficiency to about 50%.

  6. Phases of ice - Wikipedia

    en.wikipedia.org/wiki/Phases_of_ice

    One significant advantage of using ice XVII as a hydrogen storage medium is the low cost of the only two chemicals involved: hydrogen and water. [157] In addition, ice XVII has shown the ability to store hydrogen at an H 2 to H 2 O molar ratio above 40%, higher than the theoretical maximum ratio for sII clathrate hydrates, another potential ...

  7. Prolonged polar vortex has much of US preparing for life ...

    www.aol.com/prolonged-polar-vortex-much-us...

    Wind Chill, Other Cold Weather Alerts To Get New Names This Winter From National Weather Service. Forecast high temperatures in the teens and 20s are expected in the Northeast and mid-Atlantic ...

  8. Ice - Wikipedia

    en.wikipedia.org/wiki/Ice

    However, the strong hydrogen bonds in water make it different: for some pressures higher than 1 atm (0.10 MPa), water freezes at a temperature below 0 °C (32 °F). Ice, water, and water vapour can coexist at the triple point , which is exactly 273.16 K (0.01 °C) at a pressure of 611.657 Pa .

  9. AOL Mail

    mail.aol.com/?icid=aol.com-nav

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!