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  2. Lifting gas - Wikipedia

    en.wikipedia.org/wiki/Lifting_gas

    A lifting gas or lighter-than-air gas is a gas that has a density lower than normal atmospheric gases and rises above them as a result, making it useful in lifting lighter-than-air aircraft. Only certain lighter than air gases are suitable as lifting gases. Dry air has a density of about 1.29 g/L (gram per liter) at standard conditions for ...

  3. Hydrogen - Wikipedia

    en.wikipedia.org/wiki/Hydrogen

    Hydrogen gas is very rare in Earth's atmosphere (around 0.53 ppm on a molar basis [103]) because of its light weight, which enables it to escape the atmosphere more rapidly than heavier gases. However, hydrogen, usually in the form of water, is the third most abundant element on the Earth's surface, [ 104 ] mostly in the form of chemical ...

  4. Hydrogen safety - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_safety

    Since hydrogen is a lighter-than-air gas, it collects under roofs and overhangs (typically referred to as trapping sites), where it forms an explosion hazard. [14] Many individuals are familiar with protecting plants from heavier-than-air vapors, but are unfamiliar with "looking up", and is therefore of particular note. [33]

  5. Liquid hydrogen - Wikipedia

    en.wikipedia.org/wiki/Liquid_hydrogen

    Liquid hydrogen also has a much higher specific energy than gasoline, natural gas, or diesel. [12] The density of liquid hydrogen is only 70.85 kg/m 3 (at 20 K), a relative density of just 0.07. Although the specific energy is more than twice that of other fuels, this gives it a remarkably low volumetric energy density, many fold lower.

  6. Small fraction of hydrogen trapped under Earth can power ...

    www.aol.com/small-fraction-hydrogen-trapped...

    The model predicts the characteristics of hydrogen deposits based on where the gas has been found, in what quantities, and the rates at which natural processes are known to produce it.

  7. Hydrogen Fuel-Cell Vehicles: Everything You Need to Know - AOL

    www.aol.com/hydrogen-fuel-cell-vehicles...

    But unlike gasoline cars, for which there’s a well-developed set of more than 100,000 fuel stations nationwide, hydrogen drivers are utterly dependent on both a reliable supply of the gas itself ...

  8. The Most Abundant Chemical in the Universe Could Become ... - AOL

    www.aol.com/most-abundant-chemical-universe...

    Hydrogen is the most abundant element to the universe—it's actually element number one—and the atomic weight is 1.008, so 10/08 is designated National Hydrogen and Fuel Cell day, because many ...

  9. Aerostat - Wikipedia

    en.wikipedia.org/wiki/Aerostat

    Aerostats use lighter-than-air gases, such as helium or hydrogen, which provide lift because they are less dense than the surrounding air. The amount of buoyant force generated depends on the volume of the gas, its density, and the density of the outside atmosphere.

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