Wolfram Demonstrations Project

A little girl holds a large number of weather balloons. How many are too dangerous, so that she starts to "fly"? Select a number of balloons and click the "up" button to find out.

Contributed by: Enrique Zeleny

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The density of air is

and for helium it is

. The diameter of a weather balloon is

. The buoyancy force is equal to the weight of the displaced fluid

. The weight of the girl is

. Then around 88 balloons are needed to lift the girl.

Gravitational Acceleration (ScienceWorld)

Density (ScienceWorld)

Enrique Zeleny

"How Many Balloons Does It Take to Lift a Little Girl?"
http://demonstrations.wolfram.com/HowManyBalloonsDoesItTakeToLiftALittleGirl/
Wolfram Demonstrations Project
Published: May 8, 2012

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How Many Balloons Does It Take to Lift a Little Girl?

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