Closed cage with an helium balloon?

Question

Does a closed cage with an helium balloon weigh the same as an empty closed cage?
What if the balloon isn't touching the ceiling ? (It's a tall cage and we're weighing it in the process of the balloon elevating)

Martin Drautzburg · Accepted Answer

It makes no difference whether or not the balloon touches the ceiling. The weight of the cage can always be determined from the contained mass, which is less with a helium ballon inside.

J.S. Cohen · Answer

A closed cage with a helium balloon doesn't weight the same as an empty cage because the mas of a helium balloon adds to the the mass of the empty cage. A cage with a helium balloon doesn't weight less it floats (according to the Archimedes Law) in a more dense medium.

Answered by J.S. Cohen on May 13, 2021

Closed cage with an helium balloon?

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