Wednesday, April 29, 2009

Cartesian Diver

Fill 6 or more 2 litre plastic bottles with water. Have students form groups of 2 or 3.
Students need to use large container filled with water to float glass medicine dropper.
Have them adjust amount of water so that dropper just floats. In dropper shown 1 ml. of water works well.
Place the dropper in the bottle , tightly close lid and squeese the bottle with two hands. The pressure contracts the water in the dropper allowing more water to enter the dropper.


  1. Thanks for a great post. My students love cartesian divers! Have you ever tried making them with ketchup packets? ( It is a fast and easy way for my students to make one at home.

  2. Thanks Tess, I'll give the ketchup packets a try.