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Use "buoyancy" for any question where an object is suspended or submerged in a fluid. Buoyant force is the force that acts upward on a partially or completely submerged object.

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Is anti-matter less dense than a vacuum?

Fill a balloon with Helium and it floats (it is buoyant in air). 'Fill' a balloon with a vacuum (not withstanding the difficulty of a structurally stable void) and it is more buoyant as it is less den …
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