How can a paper clip float in water? Well, technically, it is not floating. It is just sitting on the surface of the water as it would sit on top of a desk.One of the properties of water is cohesion: water molecules stick to each other. Water has a high surface tension at room temperature, caused by the strong cohesion between water molecules, which can hold the weight of a paper clip laying on its side. This high surface tension is also what allows some insects to "walk on water".
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