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  2. Lifting gas - Wikipedia

    en.wikipedia.org/wiki/Lifting_gas

    As a result, a certain volume of gas has a lower density as the temperature is higher. The temperature of the hot air in the envelope will vary depending upon the ambient temperature, but the maximum continuous operating temperature for most balloons is 250 °F (121 °C). [2]

  3. Why balloon releases are not the best way to celebrate and ...

    www.aol.com/why-balloon-releases-not-best...

    Some states have banned mass balloon releases, like the one in Cleveland, Ohio, in 1986 when a charity set loose a world-record 1.5 million helium-filled balloons.

  4. Hot air balloon - Wikipedia

    en.wikipedia.org/wiki/Hot_air_balloon

    The 1785 Rozière balloon, is the main type of hybrid balloon, named after its creator, Jean-François Pilâtre de Rozier. It has a separate cell for a lighter-than-air gas (typically helium), as well as a cone below for hot air (as is used in a hot air balloon) to heat the helium at night.

  5. Superpressure balloon - Wikipedia

    en.wikipedia.org/wiki/Superpressure_balloon

    A superpressure balloon (SPB) is a style of aerostatic balloon where the volume of the balloon is kept relatively constant in the face of changes in ambient pressure outside the balloon, and the temperature of the contained lifting gas. This allows the balloon to keep a stable altitude for long periods. This is in contrast with much more common ...

  6. Helium - Wikipedia

    en.wikipedia.org/wiki/Helium

    Helium is the least water-soluble monatomic gas, [96] and one of the least water-soluble of any gas (CF 4, SF 6, and C 4 F 8 have lower mole fraction solubilities: 0.3802, 0.4394, and 0.2372 x 2 /10 −5, respectively, versus helium's 0.70797 x 2 /10 −5), [97] and helium's index of refraction is closer to unity than that of any other gas. [98]

  7. 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 ...

  8. Gas balloon - Wikipedia

    en.wikipedia.org/wiki/Gas_balloon

    The first launch of a gas balloon by Jacques Charles and Les Frères Robert, 27 August 1783, at the Champ de Mars, Paris.Illustration from the late 19th century. A gas balloon is a balloon that rises and floats in the air because it is filled with a gas lighter than air (such as helium or hydrogen).

  9. Here's why meteorologists launch weather balloons every day

    www.aol.com/weather/heres-why-meteorologists...

    Synchronized weather balloon launches have helped meteorologists create forecasts over the past 150 years, and now the old tradition is going high tech. Twice a day - every day of the year ...

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