Buoyancy of Air

This demonstration involves a balance with a brass weight and a hollow sphere placed inside a bell jar, which is then evacuated. As air is removed from the jar, the buoyant force exerted by the air on the hollow sphere decreases, causing the balance to tip. This experiment highlights the concept that air, like water, exerts a buoyant force on objects, and removing the air reduces this force. It effectively demonstrates that buoyancy is not limited to liquids but is also a property of gases.