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Fluids

Sinking and Floating: Buoyancy

Why is a stone easier to lift when it is in water?

Even though the stone sinks because it is denser than water, there is still a buoyant force on it given by Wstone - Wwater, so the stone’s weight is reduced.

Hot air balloons work by expanding the gas within the balloon so that the air within is at a lower pressure than the surrounding atmosphere.
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