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Title: Dry Tissue

Description: Because of the difference in density of the water and air, when an inverted cup is placed underwater, air that had filled in the cup before it was immersed will stop any water from entering the cup. The air cannot travel below the water because of its lighter density and is trapped below the boundaries of the cup. The tissue that was place at the bottom of the cup will not get wet unless the cup is placed under a significant depth of water, in which case, the pressure that the water will exert on the air will cause the air to compress until the water level touches the tissue.

Credits: Reimi Yonekura, Rich Wlezien, Erich Tisch, NSF


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Contributed By: Erich Tisch

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