Floating and sinking describe how objects behave when placed in a fluid such as water or air. Whether an object floats or sinks depends on the balance between its weight and the upthrust (buoyant force) exerted by the fluid. Objects that float are supported by the fluid because the upthrust is equal to or greater than their weight, while objects sink when their weight is greater than the upthrust. This concept is closely related to density and helps explain many everyday phenomena, from ships staying afloat to stones sinking in water.
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