The weight of air.

The Weight of Air. A spherical container of air hangs balanced on a balance beam in a bell jar filled with air. When the vacuum pump is used to remove the air from the bell jar, the buoyant force on the sphere is removed and the sphere sinks. FLUID STATICS
UCB Index: 
C+30+70
PIRA Index: 
2B40.40
Demo Diagram: 

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