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SCDrop a nail, bottle cap, and sponge into layered liquids, and you’re watching multiple physics principles play out at once.
The first factor is density. Every object and every liquid has its own density, and objects naturally move until they reach a layer with similar density. If the object is denser than the liquid, it keeps sinking. If it’s less dense, it floats.
Buoyancy is the upward force from the liquid pushing against the object. When buoyancy balances the object’s weight, the object stops and appears to “hover” between layers.
But motion speed is controlled by viscosity, the liquid’s resistance to flow. Thick liquids like honey create more drag and slow objects down, while thinner liquids like water allow faster movement.
That’s why in this setup some objects sink straight through, some get suspended midway, and others remain on the surface.
[ Credit - @maskmen_mc ]
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