The Bermuda triangle

The Bermuda triangle
Depot św. Wawrzyńca
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Experimental Garden im. Stanisława Lema
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Hangar Czyżyny
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The Bermuda triangle

HOW


Turn the crank and observe the object that is in the dyed water.


WHY


Initially, the object floats because its average density is less than that of water. By turning the crank, you produce air bubbles that reduce the average density of water. When it becomes less than the average density of an object, that object sinks.