cant wrap my head around it rn
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When you put air into water you break apart the molecules slightly. If you ‘zoom in’ molecular level, molecules are rubbing and slipping among one another, like oiled up guests at some Vegas nightclub. If you have a lot of these molcules and you plop a solid in it that has air, its own fluids, etc, the molecules ‘displace’ – they move aside. But since fluid doesn’t easily compress, they exert a force back the body. It is why boats sink down into the water under weight and don’t sit on the surface. Some things can do that, things that are light enough to not break the surface tension of the water.
When you put air molecules in water you are forcing the fluid molecules apart a little bit, which gives them an ability to compress and reduces the ability to exert force back on the solid body that entered it.
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