FluidsSinking 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.