Balloons are often filled with helium gas
because it weighs only about one-seventh of
what air weighs under identical conditions.
The buoyancy force, which can be expressed
as
1
Expert's answer
2020-08-28T09:50:22-0400
The buoyancy force can be expressed as
"F_b = \\rho_{air} g V_{balloon}" or, taking into account condition "\\rho_{He} = \\rho_{air} \/7" ,
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