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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.
At higher altitudes, the air pressure is lower and therefore the pressure inside the balloon is also lower. This means that while the mass of lifting gas and mass of displaced air for a given lift are the same as at lower altitude, the volume of the balloon is much greater at higher altitudes. A balloon that is designed to lift to extreme ...
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.
Each balloon in the Macy's Thanksgiving parade uses 300,000 to 700,000 cubic feet of helium. Filling every balloon costs a minimum of $510,000. ... The weather is something the parade organizers ...
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 does the Macy's Thanksgiving Parade use? Every year, approximately 400,000 to 700,000 cubic feet of helium are used to inflate the balloons for Macy's Thanksgiving Day Parade.
Helium is commercially available in either liquid or gaseous form. As a liquid, it can be supplied in small insulated containers called dewars which hold as much as 1,000 liters of helium, or in large ISO containers, which have nominal capacities as large as 42 m 3 (around 11,000 U.S. gallons).