Density. Iron and wooden cubes in a beaker with water. Wood is floating but iron has sunk to the bottom. Archimedes' principle states that the upward buoyancy force on an object immersed in a fluid is equal to the weight of the displaced fluid. It follows that a solid object with a lower density than the fluid will float (wooden cube here), while a solid with density higher than the fluid will sink (iron cube here). | |
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