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Buoyancy – Galileo’s Thermometer

I am happy with the explanation in this video. I think students would need to draw free-body force diagrams to understand the physics behind the thermometer. In one of my assignments I asked my students to look up how the density of water changes with temperature. Then work out how much sand they would need to put into ping pong balls to get them to sink at a set of given temperatures, effectively creating their own Galilean thermometer.

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