Polystyrene in water, image 2 of 2

Polystyrene in water, image 2 of 2

A350/0197 Rights Managed

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Polystyrene in water. Image 2 of 2. It has been pushed under the surface of the water, and is thus displacing an amount of water equal to its volume. Were it not being pushed under, it would displace a volume of water with the same mass as the block. As this is less than the volume of the block, the block floats. Objects with the exact same density as water displace the same volume. If they are denser, the volume of water displaced is greater than the object's volume, and it sinks. Image A350/196 shows the block floating naturally. Note the water level is around 770 millilitres here.

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Keywords: buoyancy, buoyant, demonstrating, demonstration, dense, density, effects, lab, laboratory, liquid, measuring cylinder, physical, physical effect, physics, polystyrene, school, water

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