If Kofi is standing at the bottom of a pool and Raj is floating on the surface, and they both have a balloon tied to their wrists that is filled with air, what happens to the balloons when Kofi and Raj switch positions?

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The balloon tied to Kofi's wrist at the bottom of the pool rises towards the surface because the air inside the balloon is less dense than the water surrounding it, creating a buoyant force that pushes it upward. When Kofi and Raj switch positions, with Kofi coming to the surface and Raj going to the bottom, the same physics apply; the balloon tied to Raj's wrist will also rise towards the surface for the same reason. The balloons attached to both Kofi and Raj will remain above water, trying to rise due to buoyancy, regardless of whether they are at the bottom or floating on the surface.