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Water displacement is a particular case of fluid displacement, which is simply the principle that any object placed in a fluid causes that fluid to no longer occupy that volume of space. The fluid must go somewhere, however, and so with liquids in containers, this causes their overall height to rise. Fluid displacement in general and water displacement in particular have many important effects. One of these is buoyancy, the reason why objects like corks or boats float in water. This photo shows friends getting ready to displace some water – a.k.a. swimming, at the Serpentine in Hyde Park, London.



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