The property of water that allows a water spider to walk on its surface is called surface tension. Surface tension is caused by the cohesive forces between liquid molecules, particularly due to hydrogen bonding in water, which pulls the molecules at the surface together more tightly than those in the bulk of the liquid. This creates a "skin" effect on the surface of the water that can support small objects, such as a water spider.
Hydrogen bonds pull together so tightly it causes a strong surface on the top of water letting a water spider walk on water. This property of water is called
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