Cartesian divers: Pressure on cap sends divers sinking.

2B40.30 • C+30+35

diagram for demo

Cartesian divers: Pressure on rubber stopper sends divers sinking. Two hollow glass 'divers' are filled with water and air and placed in a tall, water-filled, stoppered hydrometer jar. One diver has slightly more air than the other one. In situation 'A', both divers are at the top of the jar. In situation 'B', pressure on the rubber stopper compresses the air in each diver, sending them both downward. The diver with less air goes down further. The level to which a diver descends is sensitively controlled by the pressure on the stopper. Note: To balance a diver, hold in hot water for a short time, remove, and place in cold water. Sufficient water will be drawn into the diver to make it balance. If too heavy, shake out excess water. FLUID STATICS

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