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======Cartesian Diver======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Categories:** {{$demo.categories}}
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**Alternative titles:**
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/* SUMMARY - Required                                                                                  */
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====Summary====                   
{{$demo.summary}}


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/* PROCEDURE - Optional                                                                                */
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====Procedure====  
  - Fill a clear plastic bottle about three-quarters full with water.  
  - Place a condiment packet or pen lid weighted with paper clips into the bottle, making sure it just barely floats.  
  - Add more water until the bottle is completely full and screw the cap on tightly.  
  - Squeeze the sides of the bottle firmly and observe what happens to the packet.  
  - Release the pressure and observe the packet again.


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====Links==== 
Cartesian Divers - ScienceOnline: 
{{youtube>QukS1pxoezY?}}\\
The Cartesian Diver - Hungry SciANNtist: 
{{youtube>aYNpTomZeGM?}}\\
📄 Cartesian Diver - ACN: [[https://www.acs.org/education/activities/cartesian-diver.html]]\\


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====Variations====
  * Use different types of condiment packets to see which works best.  
  * Try using a glass eyedropper or a plastic pipette with an air bubble as the diver instead of a condiment packet.  
  * Experiment with bottles of different sizes to see how it affects the diver’s movement.


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====Safety Precautions====
None


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====Questions to Consider====
  * What happens to the air bubble inside the condiment packet or pen lid when you squeeze the bottle?  
  * Why does increasing pressure make the packet sink?  
  * How does releasing the pressure cause the packet to float again?  
  * Would the diver behave differently if the air bubble were larger or smaller?  
  * How does this experiment relate to real-world concepts of buoyancy and density?


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/* Complete information in the Demonstration Info box below, following instructions exactly. */