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How would the size of each balloon compare to the size that would be needed on the

How would the size of each balloon compare to the size that would be needed on the - Physics Forum

How would the size of each balloon compare to the size that would be needed on the - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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Old 06-25-2009, 05:16 PM
Pipette Filler
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Default How would the size of each balloon compare to the size that would be needed on the



Earth? Venusís atmosphere is much more dense than the Earthís while that of Mars is much less dense. Suppose it is decided to send a probe to each planet that, once it arrived, would be carried around in the planetís atmosphere by a helium-filled balloon. How would the size of each balloon compare to the size that would be needed on the Earth?
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Old 06-25-2009, 05:16 PM
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It wouldn't matter because helium is less dense than Oxygen so both would rotate at the same pace the would on earth. however the gravitational pulls would be different so I;m assumin on venus the balloon would rotate around the planet much quciker than on earth and on mars the opposite
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Old 06-25-2009, 05:16 PM
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It wouldn't matter because helium is less dense than Oxygen so both would rotate at the same pace the would on earth. however the gravitational pulls would be different so I;m assumin on venus the balloon would rotate around the planet much quciker than on earth and on mars the opposite
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Old 03-31-2012, 11:07 AM
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Default Re: How would the size of each balloon compare to the size that would be needed on th

helium and atmospheric densities (and thus, I say, the masses of the helium in the balloon and the equal displaced volume of atmosphere) are proportional to their molecular weights. This means that, regardless of pressure and temperature, the balloon gas can lift a mass equal to the mass difference Δm of the two equal volumes, and the lift force is proportional to Δm*g. This cancels the effect of g on payload weight.
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