Buoyant force determines if objects float or sink based on average density and surrounding fluid density.
Buoyant force is the net upward force on any object in a fluid. If the buoyant force is greater than the object's weight, it will float; if less, it will sink. Average density determines whether objects sink or float based on the surrounding fluid's density. A key principle is that objects float when the buoyant force equals their weight.
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