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Archimedes' principle: This is a demonstration of the Archimedes Principle which states that when an object is immersed in a fluid it apparently loses weight and the apparent loss is equal to the weight of the fluid displaced by the object . Use a spring balance to weigh a potato in air, then immerse it completely in water using the beaker and overflow apparatus shown in the video. Collect the displaced water and measure it. The weight lost by the potato bobbing in water is equal to the weight of the displaced, or overflow liquid. This is the essence of Archimedes' Principle, which connects the upthrust of water (buoyant force) to the apparent weight loss of a body immersed in water, to the weight of the liquid that is displaced - all three are equal.