2B40.30 - Cartesian Diver

Code Number:
Demo Title:
Cartesian Diver
Pressure vs. Air Volume
Area of Study:
Heat & Fluids
Cartesian Diver.

Periodically the balloon in the large Cartesian Diver will need to be changed.  This is done by removing the top of the apparatus and pulling on the string that is attached to the balloon.  Water will also need to be added to the unit before each use.

Fill the eye dropper with enough water so that it just barely floats.  Fill the plastic bottle so that there is no air in it when the lid is screwed on.  Make sure the lid is on very tightly.  Squeezing the bottle should make the diver sink.

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Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.