How does it work?
In air, bodies experience just as much buoyancy as in water. The larger the volume of the body, the greater the buoyancy. However the buoyancy experienced by the inflated balloon is counteracted by the mass of the air inside the balloon. This may lead us to think the scales should stay balanced, as the buoyant force is equal to the weight of the air in the balloon.
The reason the inflated balloon falls to the ground is that the skin of the balloon compresses the air inside it. This compressed air then has a greater density than the air surrounding the balloon, causing it to be heavier and to sink.
