Cartesian Bottle Diver
this scubadiver shows water pressure As the water level inside the diver goes up, it compresses the air above it into a smaller space.As the water level rises in the diver, it becomes less buoyant and the diver sinks. As you release the pressure on the bottle, the compressed air expands and forces the water back out.
Supplies
the suplies are simple
a bottle of water
a rubberband
a paper clip
and a straw
To Make the Diver
to make the diver get a rubberband and wrap it around the straw then add a paper clip or 2
Make Sure the Straw Is at or Next to the Surface
to do this add a paper clip to weigh it down
now watch as your diver go down and up as you squeze the bottle
and here is another way to make this project