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  2. High-altitude balloon - Wikipedia

    en.wikipedia.org/wiki/High-altitude_balloon

    Geostationary balloon satellites (GBS) are proposed high-altitude balloons that would float in the mid-stratosphere (60,000 to 70,000 feet (18 to 21 km) above sea level) at a fixed point over the Earth's surface and thereby act as an atmospheric satellite. At those altitudes, air density is around 1/15 to 1/20 [37] of what it is at sea level ...

  3. Buoyancy - Wikipedia

    en.wikipedia.org/wiki/Buoyancy

    Buoyancy (/ ˈ b ɔɪ ən s i, ˈ b uː j ən s i /), [1] [2] or upthrust is a net upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid.

  4. Lava balloon - Wikipedia

    en.wikipedia.org/wiki/Lava_balloon

    Lava balloons during the 2011–12 El Hierro eruption, floating on discoloured water. A lava balloon is a gas-filled bubble of lava that floats on the sea surface. It can be up to several metres in size. When it emerges from the sea, it is usually hot and often steaming.

  5. How Much Does a Float in the Macy’s Thanksgiving Day ... - AOL

    www.aol.com/finance/much-does-float-macy...

    2. Giant Balloons Rack Up Costs of $510,000. Inflating balloons that can stretch up to five or six stories high is seriously expensive. Each balloon in the Macy's Thanksgiving parade uses 300,000 ...

  6. Lifting gas - Wikipedia

    en.wikipedia.org/wiki/Lifting_gas

    A balloon can only have buoyancy if there is a medium that has a higher average density than the balloon itself. Balloons cannot work on the Moon because it has almost no atmosphere. [15] Mars has a very thin atmosphere – the pressure is only 1 ⁄ 160 of earth atmospheric pressure – so a huge balloon would be needed even for a tiny lifting ...

  7. Float (liquid level) - Wikipedia

    en.wikipedia.org/wiki/Float_(liquid_level)

    A float ball (in orange color) Liquid level floats, also known as float balls, are spherical, cylindrical, oblong or similarly shaped objects, made from either rigid or flexible material, that are buoyant in water and other liquids.