Why do balloons filled with hydrogen gas move up in the air?

Due to the up thrust of air

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Due to the weight of the balloon

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Due to the buoyant force

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Both A and C

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Solution

The correct options are
A Due to the up thrust of air
C Due to the buoyant force
A body experiences an upthrust and upward force (buoyant force) in gas too. A balloon filled with hydrogen gas moves in the upward direction due to the upthrust of air present underneath it. This happens due to the fact that hydrogen gas is lighter than air.

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Q. Define thrust. What is the up thrust experienced by a balloon of volume 120

m^{3}

filled with hydrogen. The density of air = 1.140

\frac{k g}{m^{3}}

and density of hydrogen = 0.081

\frac{k g}{m^{3}}

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What is the up thrust experienced by a balloon of volume 120 $m^{3}$ filled with hydrogen. The density of air = 1.140 $\frac{k g}{m^{3}}$ and density of hydrogen = 0.081 $\frac{k g}{m^{3}}$ at room temperature. What is the maximum weight this balloon can lift?

Q. A balloon filled up with gas would only go up in air if it is filled up with _____.

Q. Balloon '

A

' is filled with air and Balloon '

B

' is filled with

H_{2}

gas. Which balloon rises high up in the sky?

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