PhysicsFun 721 - The Cartesian Diver
Cartesian Diver: increasing pressure on the water compresses the air bubble in the small plastic vial (here in the shape of an octopus' head) filling it further with water and making the diver sink. Pascal's principle states that any change in pressure on an enclosed fluid (such as squeezing the plastic bottle) is transmitted evenly to every part of the fluid- the physics of hydraulic brakes! The physics here is great- but the biology is questionable: it's not clear why an octopus would need mask and snorkel!
Physics describes the real magic of the universe.
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