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A weather balloon, also known as a sounding balloon, is a balloon (specifically a type of high-altitude balloon) that carries instruments to the stratosphere to send back information on atmospheric pressure, temperature, humidity and wind speed by means of a small, expendable measuring device called a radiosonde.
The BLAST high-altitude balloon just before launch on June 12, 2005. High-altitude balloons or stratostats are usually uncrewed balloons typically filled with helium or hydrogen and released into the stratosphere, generally attaining between 18 and 37 km (11 and 23 mi; 59,000 and 121,000 ft) above sea level.
On July 2, 1982, Larry Walters (April 19, 1949 – October 6, 1993) made a 45-minute flight in a homemade aerostat made of an ordinary lawn chair and 42 helium-filled weather balloons. [2] The aircraft rose to an altitude of about 16,000 feet (4,900 m), drifted from the point of liftoff in San Pedro, California , and entered controlled airspace ...
how much helium is needed? Enough to fill 600,000 to 700,000 Mylar party balloons. But the parade helium is 99.999 percent pure, whereas the stuff in a party balloon might be only 97.5 percent pure.
A Skyhook balloon launched in 1957 to photograph the Sun. Skyhook balloons were high-altitude balloons developed by Otto C. Winzen and General Mills, Inc.They were used by the United States Navy Office of Naval Research (ONR) in the late 1940s and 1950s for atmospheric research, especially for constant-level meteorological observations at very high altitudes.
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 ...