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Visual science, half (8/40) The bath is half full! Ok that's it for today! If you want to hang about we are looking a little closer at baths, and thinking about extrapolation and other fun facts! When an object displaces a quantity of water that is equal to its own weight, the buoyant force acting will be equal to gravity at which point the object will float, however, if the object weighs more than the water it's displacing, the buoyant force acting will be less than gravity, so it will sink.