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Re: [Phys-l] Space Balloon



Yes, but it is in free fall so there is no observable gravitational field
inside the cabin. So there is no difference in pressure due to the
gravitational field, and no buoyancy. Free fall according to the principle
of equivalence looks like no gravitational field. Balloons only float when
more dense objects fall!!!

John M. Clement
Houston, TX


*** a) If the spacecraft is in orbit around the earth, there must be a
downward force on the spacecraft to keep it in orbit. Remember that the
space shuttle cabin is usually filled with air at atmospheric pressure to
keep the astronauts happy. Since the helium filled balloon is lighter
than the air in the cabin, the air buoyancy force would lift it toward
the ceiling of the spacecraft.