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Why does a dense ball feel lighter when it's immersed in water?
When objects are placed in water they feel lighter because of buoyancy. Buoyancy is the upward force all liquids and gases exert on any object immersed in them in the presence of gravity. Archimedes’ principle says that the force pushing an object under the water, is equal to the mass of the water the object is pushing out of the way. So objects will seem lighter because the water is actually pushing the object up.