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Is it appropriate to say that the bubble has negative mass? The
gravitational force on the bubble is still down, no? I'm
missing something here.
True unless we neglect the mass of the air ..or perform the
experiment in
a vacuum! Use an evacuated bottle which is 90% full of some
fluid having
low vapor pressure. The bubble of vacuum will still act the same as a
bubble of air even though it contains no matter.