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8th Grade Science Projects

Cartesian Diver Experiment (Video)

How do fish float and sink? This classic experiment is called Cartesian Diver, named after French scientist, mathematician and philosopher scientist, René Descartes. It demonstrates the principles of buoyancy and density and explains how fish dive or rise in water. Buoyancy: the force of buoyancy on an object is equal to the weight of the water displaced by that object. Density: if an object …

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Do Grapes Sink Or Float? | Salt Water Density Experiment

Do grapes sink or float? Grapes can do both. Whether a grape sinks or floats depends on its density relative to the water it’s in. An object’s buoyancy is determined by its density compared with the density of the surrounding water. Density of water can be changed by adding salt. Let’s try this experiment to …

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What Makes Ice Melt Faster? Salt Melts Ice Experiment

Why do people put salt in snow? That’s because salt can make ice melt faster. Ice melts at a specific temperature called the melting point. Salt makes snow melt faster by changing ice’s melting point. Here is an experiment showing how salt achieves that. Using salt, you can pick up a piece of ice with …

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