Cartesian Divers

Date:  8/31/2012

Name: Gabriel Robinson

Cartesian Divers

 

 

 

Materials: pipette's, a 2-Liter, a washer, h2o, tape, and paperclips.

 

 

Safety Concerns:  None.

 

 

Procedure:

 



 

        First fill up a 2-Liter, all the way to the top - the less air the better.  Then cut one inch off the pipette, to make it easier to work with.  Put a washer on the pipette at the mid-way point.  Secure the wasger with tape.  Fill the pipette up with a little water, and put it into the 2-Liter. Cap off the 2-Liter, but be careful not to create a vacuum. Then apply pressure to the bottle and the pipette will sink.

 

 

 

How Does it work?

 

 

 

       The Cartesian Divers work because of pressure. They float because they are less dense than water, which is 1g per ml. The air makes the pipette's less than 1. When you apply force to the bottle you are forcing watter into the pipette, thus making it sink. When you release the pressure the watter escapes and it will rise to the top.  Now, the more water already in the pipette's will make it sink at different speeds, same with weight. Brakes on a car, or your heart are very similar to Caresian Divers.

 

 

 

My Results/ Errors:

 

 

       When my partner and I started off we had to much air in the 2-Liter, making it harder to sink.  We eventually got help from Zach and from Mrs. Sorenson. They showed us how to correctly make the Cartesian Divers sink.  After we fixed it, by adding more water and taking a little water out of the pipette we finally succeeded. In the end we got three to successfully sink and come back up in the correct order.